Transcription
For Answer and Explanation Question Click the Link in Pink Color.Page 218 Human Eye and Colourfull WorldChap 7 CHAPTER7 The Human Eye and Colourful World Summarglass prism.7.1 Angle of PrismA triangular prism is a homogeneous, transparentrefracting medium bound by two non-parallelrefracting surfaces inclined at some angle ( A)called the angle of prism. A section of the prismis a triangle ABC as shown in the figure.7.3 Dispersion of lightWhen a narrow beam of white light passesthrough a prism, it splits up into a band of sevencolours. Splitting of white light into its sevenconstituent (acronym VIBGYOR) colours onpassing through a dispersive medium, i.e., theglass prism is called dispersion of light.Out of seven colours, the violet deviatesmaximum and red deviates minimum. As aresult, the coloured band obtained on the screenis called spectrum.7.2 Incident, Refracted and EmergentraysRefraction through a prism is shown in the givenfigure. In this figure, PQE is the incident ray,EF the refracted ray and FRS the emergentray. i is the angle of incidence, e the angleof emergence and D the angle of deviationsuffered by light ray due to refraction at the1. Dispersion is caused by the difference indeviation angles for light rays of differentwavelengths. The violet light has minimumwavelength, so, it deviates the maximum.To Purchase Hard Book of From Amazon Click Here.For More Details Whatsapp at 8905629969
This PDF is review version of hard book available on Amazon. In hard book full explanation are given with question.Chap 7 Human Eye and Colourfull World Page 219The red light has maximum wavelength, so,it deviates the minimum.2. The seven constituent colours of white lightsplitted by a glass prism can be recombinedto form white light by passing them throughanother identical prism fixed in an invertedposition.3. Rainbow forms after rains because ofdispersion on light and the interval reflectioncaused by tiny water droplets suspendedin air. Thus, the tiny water droplets act asprisms.A rainbow always forms in a directionopposite to that of the sun. In a rainbow, theinnermost arc is violet and the outermost arc isred.7.4 atmospheric refraction1. In the atmosphere, the layers of coolerair have higher optical density and act asoptically denser medium. The layers ofwarmer air have lower optical density andact as optically rarer medium.Atmospheric refraction is the refractionof light while passing from one air layer toanother air layer of different optical densities(or refractive indices).2. Stars twinkle in night sky due to atmosphericrefraction. The apparent positions of astar appears slightly higher than its actualposition.3. Due to atmospheric refraction, the sun isvisible to us 2 minutes before actual sunrise.Again, the sun remains visible for 2 minuteseven after actual sunset. So, apparentduration of time from sunrise to sunset is 4minutes more than the actual duration.4. Due to atmospheric refraction, the shapeof the sun at the time of sunrise or sunsetappears to be of oval shape.7.5 Scattering of lightThe process due to which light gets deflectedand diffused all over as a result of its interplaywith tiny matter particles is called scattering oflight. The tiny particle which causes scatteringof light is called the scatterer particle.1. The colour of the scattered light is basedupon the size a of the scattering particleas compared to wavelength λ of the light.If a λ , then light of shorter wavelengthsis scattered much more than light of longerwavelengths. According to Rayleigh’s law ofscattering, the intensity I of scattered light isinversely proportional to fourth power of itswavelength, i.e., I ? 1/λ 4 (when a λ) .2. The phenomenon of scattering of light bysuspended particles present in the medium(through which a light beam is passing) andmaking the path of the light beam visible,is called Tyndall effect. The path of a lightbeam passing through a colloidal solutionbecomes visible because of scattering of lightcaused by colloidal particles. When lightbeam form the headlight of an automobilecomes through mist and fog, then particlesbecome visible because of Tyndall effect. Theparticles scatter the light beam and becomevisible.3. Air molecules have a size much smaller thanthe wavelength of light. Hence, they scatterblue-violet light of smaller wavelengthsmuch more than red-orange light of longerwavelengths. Consequently, clear sky appearsto be blue. But when looking the sky from aspaceship, it appears to be dark as there areno air particles in space to cause scatteringof light.4. Danger signals are always red in colour.This is because red colour has the maximumwavelength and hence is scattered the leastby atmospheric particles. Thus, red signal isvisible from a longer distance.5. The sun appears reddish at the time ofsunrise and sunset. This is because sun isnear the horizon and sunlight has to travela longer distance to reach our eyes. Allshorter wavelengths are scattered away byair particles and only red colour reaches oureyes. ******To Purchase Hard Book of From Amazon Click Here.For More Details Whatsapp at 8905629969
For Answer and Explanation Question Click the Link in Pink Color.Page 220 Human Eye and Colourfull World mulitiple choice QUESTION1.Consider the following statements aboutdispersion by glass prism :1. Splitting of light into its componentcolours is called dispersion.2. Issac Newton was the first to observedispersion.Choose the correct option from the codesgiven below:(a) Only 1(b) Only 2(c) Both 1 and 2(d) Neither 1 nor 2are involved in the formation of a rainbow?(a) Reflection, refraction and dispersion.(b) Reflection, dispersion and totalinternal reflection.(c) Refraction, dispersion and internalreflection.(d) Dispersion, scattering and totalinternal reflection.Sol : www.cbse.site/sc/hm1045.Sol : www.cbse.site/sc/hm1012.Which of the following are effects ofatmospheric refraction?1. Twinkling of stars.2. Tyndall effect.3. Advance sunrise and delayed sunset.Choose the correct option from the codesgiven below:(a) 1 and 2(b) 2 and 3(c) 1 and 3(d) 1, 2 and 3At noon the sun appears white as(a) light is least scattered(b) all the colours of the white light arescattered away(c) blue colour is scattered the most(d) red colour is scattered the mostSol : www.cbse.site/sc/hm1034.Which of the following phenomena of lightTwinkling of stars is due to atmospheric(a) dispersion of light by water droplets(b) refraction of light by different layersof varying refractive indices(c) scattering of light by dust particles(d) internal reflection of light by cloudsSol : www.cbse.site/sc/hm1056.Sol : www.cbse.site/sc/hm1023.Chap 7The clear sky appears blue because(a) blue light gets absorbed in theatmosphere(b) ultraviolet radiations are absorbed inthe atmosphere(c) violet and blue lights get scatteredmore than lights of all other coloursby the atmosphere(d) light of all other colours is scatteredmore than the violet and blue colourlights by the atmosphereSol : www.cbse.site/sc/hm1067.Which of the following statements iscorrect regarding the propagation of lightof different colours of white light in air?(a) Red light moves fastest.(b) Blue light moves faster than greenlight.(c) All the colours of the white light movewith the same speed.To Purchase Hard Book of From Amazon Click Here.For More Details Whatsapp at 8905629969
This PDF is review version of hard book available on Amazon. In hard book full explanation are given with question.Chap 7 Human Eye and Colourfull World Page 221(d) Yellow light moves with the meanspeed as that of the red and the violetlight.(d) YellowSol : www.cbse.site/sc/hm111Sol : www.cbse.site/sc/hm1078.The danger signals installed at the topof tall buildings are red in colour. Thesecan be easily seen from a distance becauseamong all other colours, the red light:(a) is scattered the most by smoke or fog(b) is scattered the least by smoke or fog(c) is absorbed the most by smoke or fog(d) moves fastest in air.Sol : www.cbse.site/sc/hm1089.Which of the following phenomenacontributes significantly to the reddishappearance of the sun at sunrise or sunset?(a) Dispersion of light(b) Scattering of light(c) Total internal reflection of light(d) Reflection of light from the earthSol : www.cbse.site/sc/hm10910. The bluish colour of water in deep sea isdue to(a) the presence of algae and other plantsfound in water(b) reflection of sky in water(c) scattering of light(d) absorption of light by the sea.Sol : www.cbse.site/sc/hm11011. Which colour suffers least deviation onpassing through a prism?(a) Green(b) Violet(c) Red12. To an astronaut, the sky appears(a) blue(b) red(c) white(d) darkSol : www.cbse.site/sc/hm11213. Which phenomenon is responsible forincreasing the apparent length of the dayby 4 minutes?(a) Refraction of light(b) Scattering of light(c) Dispersion of light(d) Atmospheric refractionSol : www.cbse.site/sc/hm11314. What is the order of shortest visiblewavelength?c(a) 3000 Ac(b) 4000 Ac6500 Ac(d) 8000 A(c)Sol : www.cbse.site/sc/hm11415. The intensity of scattered light (I ) varieswith wavelength as, I ? λn , where n equals(a) 4(b) 3(c) 2(d) - 4Sol : www.cbse.site/sc/hm115To Purchase Hard Book of From Amazon Click Here.For More Details Whatsapp at 8905629969
For Answer and Explanation Question Click the Link in Pink Color.Page 222 Human Eye and Colourfull World16. How many times does a ray of light bendon passing through a prism?(a) Once(b) Twice(c) Thrice(d) Four timesChap 7the sky?Sol : www.cbse.site/sc/hm116Don’t Take Printout of This File becausethis is not useful. You can purchase hardbook from Amazon. Hard book includesexplanation of all MCQs in print form.17. Which phenomenon is not explained on thebasis scattering of light?(a) White colour of clouds(b) Blue colour of clear sky(c) Red colour of danger signals(d) Advanced sunriseSol : www.cbse.site/sc/hm11718. Advanced sunrise and delayed sunset areexplained on the basis of(a) Tyndall effect(b) scattering of light(c) dispersion of light(d) atmospheric refractionSol : www.cbse.site/sc/hm11819. A prism ABC (with BC as base) is placedin different orientations. A narrow beamof white light is incident on the prism asshown in figure. In which of the followingcases, after dispersion, the third colourfrom the top corresponds to the colour of(a)(b)(c)(d)(i)(ii)(iii)(iv)Sol : www.cbse.site/sc/hm11920. A ray of light falls on one face of anequilateral glass prism at 40c and emergesfrom the other face at the same angle. Thedeviation suffered by the ray is(a) 20c(b) 40c(c) 60c(d) 80cSol : www.cbse.site/sc/hm12021. Angle of deviation through a prism of angle60c when angles of incidence and emergenceare 40c each is:(a) 40c(b) 30c(c) 60c(d) None of theseTo Purchase Hard Book of From Amazon Click Here.For More Details Whatsapp at 8905629969
This PDF is review version of hard book available on Amazon. In hard book full explanation are given with question.Chap 7 Human Eye and Colourfull World Page 223Sol : www.cbse.site/sc/hm12122. If angle of deviation through a prism ofangle 60c is 40c, angle of incidence (beingequal to angle emergence) would be:(a) 50c(b) 60c(c) 40c(d) None of theseSol : www.cbse.site/sc/hm12223. A prism is a transparent medium whichhas . triangular bases and .rectangular lateral surfaces.(a) two, three(b) three, two(c) one, two(d) two, four. and . colour respectively.(a) red, blue(b) red, indigo(c) red, yellow(d) violet, greenSol : www.cbse.site/sc/hm12526. The phenomenon of splitting of white lightby prism is called . .(a) refraction(b) reflection(c) dispersion(d) Total internal reflectionSol : www.cbse.site/sc/hm12627.Sol : www.cbse.site/sc/hm12324. Angle of deviation is depends on:(a) Angle of prism(b) Nature of material of prism(c) Angle of incidence on the prism(d) All of the aboveSol : www.cbse.site/sc/hm124Here X and Y indicates:(a) Green colour, violet colour(b) Red colour, violet colour(c) Violet colour, red colour(d) Green colour, red colourSol : www.cbse.site/sc/hm12725.Dispersion of light by glass prism is shownin the above figure. Here x and y indicates28. Which of the following phenomenacontributes significantly to the reddishappearance of sun at sunrise or sunset?(a) Dispersion of light(b) Scattering of light(c) Total internal reflection of light(d) Reflection of light from the earthSol : www.cbse.site/sc/hm128To Purchase Hard Book of From Amazon Click Here.For More Details Whatsapp at 8905629969
For Answer and Explanation Question Click the Link in Pink Color.Page 224 Human Eye and Colourfull World29. The relation between intensity of scatteredlight (I ) and wavelength (λ) is:(a) I ? 12λ(b) I ? 13λ(c) I ? 1λ(d) I ? 14λSol : www.cbse.site/sc/hm12930. Which of the colours of visible light hasminimum frequency?(a) violet(b) red(c) yellow(d) greenSol : www.cbse.site/sc/hm13031. The optical density of our atmosphere. with altitude.(a) decreases(b) increases(c) remain same(d) first increase than decreaseSol : www.cbse.site/sc/hm131Chap 7frequency?(a) Indigo(b) Orange(c) Red(d) VioletSol : www.cbse.site/sc/hm13334. Which of following gives monochromaticlight?(a) Sodium lamp(b) Mercury lamp(c) Spark lamp(d) All of the aboveSol : www.cbse.site/sc/hm13435. . is a natural spectrum appearing insky after a rain shower.(a) Twinkling of stars(b) Advance sunrise and delay sunset(c) Colour of the sun at sunrise and sunset(d) RainbowSol : www.cbse.site/sc/hm13536. In given figure, a light ray AB is incidentnormally on one face PQ of an equilateralglass prism.The angles at faces PR is:32. The angle between the refracting surfacesof prism is called angle of . .(a) refraction(b) prism(c) reflection(d) both (a) and (b)Sol : www.cbse.site/sc/hm13233. Which of the following colour has maximum(a)60cTo Purchase Hard Book of From Amazon Click Here.For More Details Whatsapp at 8905629969
This PDF is review version of hard book available on Amazon. In hard book full explanation are given with question.Chap 7 Human Eye and Colourfull World Page 225(b) 30c(c) 45c(d) 90cSol : www.cbse.site/sc/hm13637. Light rays are deviated by a prism as shownin the figure.Sol : www.cbse.site/sc/hm13738. A light ray is incident perpendicularly to oneface of a 90c prism and is totally internallyreflected at the glass-air interface. If theangle of reflection is 45c, we conclude thatthe refractive indexThe deviation angle δ is measured for lightrays of different frequency, including bluelight and red light. Which of the followinggraph is correct?(a) n 12(b) n 2n 12(d) n 2(c)Sol : www.cbse.site/sc/hm13839. A student traces the path of a ray of lightthrough a glass prism for different anglesof incidence. He analysis each diagram anddraws the following conclusion:I. On entering prism, the light ray bendstowards its base.II. Light ray suffers refraction at the pointof incidence and point of emergence whilepassing through the prism.To Purchase Hard Book of From Amazon Click Here.For More Details Whatsapp at 8905629969
For Answer and Explanation Question Click the Link in Pink Color.Page 226 Human Eye and Colourfull WorldIII. Emergent ray bends at certain angle tothe direction of the incident ray.IV. While emerging from the prism, the lightray bends towards the vertex of the prism.Out of the above inferences, the correctones are:(a) I, II and III(b) I, III and IV(c) II, III and IV(d) I and IVChap 741.Which of the following angles are correctlymarked in the above ray diagram?(a) i , A and D(b) Only i and A(c) i , r and A(d) All of the anglesSol : www.cbse.site/sc/hm13940. In which of the following diagrams is thepath of a ray of light passing through aglass prism shown correctly?Sol : www.cbse.site/sc/hm14142.(a)(b)(c)(d)IIIIIIIVSol : www.cbse.site/sc/hm140Which of the following angles are correctlymarked in the above diagram?(a) A , r and D(b) A and e(c) i , A and D(d) A , r and eSol : www.cbse.site/sc/hm14243. During the experiment, to trace the path ofray of light through the glass prism, studentsreported at the following observations:1. The ray of light from air to glass at thefirst refracting surface bends away fromthe normal after refraction.To Purchase Hard Book of From Amazon Click Here.For More Details Whatsapp at 8905629969
This PDF is review version of hard book available on Amazon. In hard book full explanation are given with question.Chap 7 Human Eye and Colourfull World Page 2272. At the second refracting surface, lightrays entered from air to glass.3. Light ray suffers two refractions on passingthrough a prism and in each refraction itbends towards the base of the prism.4. Light ray suffers two refractions on passingthrough a prism. In first refraction itbends away from the normal while in thesecond refraction it bends towards thenormal.The correct observation(s) is/are:(a) 1 and 2 only(b) 3 only(c) 2 and 4 only(d) 1 and 4 onlySol : www.cbse.site/sc/hm14344. Study the following ray diagram:(c) Both deviation and dispersion(d) Atmospheric refractionSol : www.cbse.site/sc/hm14546. A student traces the path of a ray oflight through a triangular glass prism fordifferent values of angle of incidence. Onanalyzing the ray diagrams, which one ofthe following conclusions is he likely todraw?(a) The emergent ray is not parallel tothe incident ray.(b) The emergent ray bends at an angleto the direction of the incident ray.(c) The emergent ray and the refractedray are at right angles to each other.(d) The emergent ray is perpendicular tothe incident ray.Sol : www.cbse.site/sc/hm146In this diagram, the angle of incidence, theangle of emergence and the angle of deviationrespectively have been represented by(a) y, p, z(b) x, q, z(c) p, y, z(d) p, z, ySol : www.cbse.site/sc/hm14445. When white light passes through theachromatic combination of prisms, thenwhat is observed ?(a) Deviation(b) Dispersion47. Which one of the following statements iscorrect?(a) The rainbow is produced by thereflection of white sun light by waterdrops in the atmosphere.(b) The blue colour of the sky is due toscattering of light.(c) The stars appear higher in the skythan actually are,due to scattering oflight.(d) The planets twinkle at night due toatmospheric refraction of light.Sol : www.cbse.site/sc/hm14748. Rainbow is observed when the Sun is(a) Vertically above the observer(b) Behind the observer(c) In front of the observer(d) Position is not definedTo Purchase Hard Book of From Amazon Click Here.For More Details Whatsapp at 8905629969
For Answer and Explanation Question Click the Link in Pink Color.Page 228 Human Eye and Colourfull WorldSol : www.cbse.site/sc/hm14849. Which phenomenon does not play a role inthe formation of rainbow ?(a) Absorption(b) Reflection(c) Refraction(d) DispersionSol : www.cbse.site/sc/hm14950. The phenomenon of dispersion proves that:(a) light does not pass through an opaquemedium and absence of the lightcauses shadow.(b) light moves in the straight line.(c) light passes through a transparentmedium.(d) white light is made up of sevenconstituent colours.Sol : www.cbse.site/sc/hm15051. How will you use two identical prisms sothat a narrow beam of white light incidenton one prism emerges out of the secondprism as white light?(a) One placed inverted with respect tothe other.(b) One placed on top of the other.(c) Just put them side by side.(d) Parallel to each other.Sol : www.cbse.site/sc/hm15152. A light ray of a single wavelength is incidenton the prism. The emergent light is bestdescribed by a(a) Light ray of same wavelength deviatedby an angle.(b) Laterally shifted ray of sameChap 7wavelength.(c) Spectrum of component colours.(d) Light ray of different wavelengthdeviated by an angle.Sol : www.cbse.site/sc/hm15253. When white light is passed through twoconsecutive prisms, the resultant will be(a) Seven colour(b) White beam(c) Yellow light(d) Green lightSol : www.cbse.site/sc/hm15354. Assertion : Colour of sun is red at the timeof sunset and sunrise.Reason : Colour of blue end of spectrum getscattered due to their smaller wavelengthsand light reaching earth’s surface from sunis rich in red colour end.(a) Both Assertion and Reason are trueand Reason is the correct explanationof Assertion.(b) Both Assertion and Reason aretrue but Reason is not the correctexplanation of Assertion.(c) Assertion is true but Reason is false.(d) Both Assertion and Reason are false.Sol : www.cbse.site/sc/hm15455. Assertion : Planets do not twinkle.Reason : Planets do not show thephenomenon of scattering.(a) Both Assertion and Reason are trueand Reason is the correct explanationof Assertion.(b) Both Assertion and Reason aretrue but Reason is not the correctexplanation of Assertion.(c) Assertion is true but Reason is false.To Purchase Hard Book of From Amazon Click Here.For More Details Whatsapp at 8905629969
This PDF is review version of hard book available on Amazon. In hard book full explanation are given with question.Chap 7 Human Eye and Colourfull World Page 229(d) Both Assertion and Reason are false.Sol : www.cbse.site/sc/hm15556. Assertion : When a light ray is refractedthrough a glass prism, emergent ray isparallel to incident ray.Reason : Two sides of prism doing refractionare parallel to each other.(a) Both Assertion and Reason are trueand Reason is the correct explanationof Assertion.(b) Both Assertion and Reason aretrue but Reason is not the correctexplanation of Assertion.(c) Assertion is true but Reason is false.(d) Both Assertion and Reason are false.Sol : www.cbse.site/sc/hm15657. Assertion : A rainbow is a natural spectrumappearing in the sky after a rain shower.Reason : It is caused by reflection ofsunlight by tiny water droplets present inthe atmosphere.(a) Both Assertion and Reason are trueand Reason is the correct explanationof Assertion.(b) Both Assertion and Reason aretrue but Reason is not the correctexplanation of Assertion.(c) Assertion is true but Reason is false.(d) Both Assertion and Reason are false.Sol : www.cbse.site/sc/hm15758. Assertion : Different colour of light bendsthrough different angles with respect tothe incident ray when they pass through aprism. The red light bends the least whileviolet the most.Reason : Different colour of light bendsthrough different angles with respect tothe incident ray when they pass through aprism. The red light bends the least whileviolet the most.(a) Both Assertion and Reason are trueand Reason is the correct explanationof Assertion.(b) Both Assertion and Reason aretrue but Reason is not the correctexplanation of Assertion.(c) Assertion is true but Reason is false.(d) Both Assertion and Reason are false.Sol : www.cbse.site/sc/hm15859. Assertion : A prism deviates a ray of lighttowards its base.Reason : Both refracting sides scatter thelight.(a) Both Assertion and Reason are trueand Reason is the correct explanationof Assertion.(b) Both Assertion and Reason aretrue but Reason is not the correctexplanation of Assertion.(c) Assertion is true but Reason is false.(d) Both Assertion and Reason are false.Sol : www.cbse.site/sc/hm15960. Assertion : Sun is visible to us 2 minutesafter the actual sunrise and about 2 minutesbefore the actual sunset.Reason : It is caused due to rotation andrevolution of earth.(a) Both Assertion and Reason are trueand Reason is the correct explanationof Assertion.(b) Both Assertion and Reason aretrue but Reason is not the correctexplanation of Assertion.(c) Assertion is true but Reason is false.(d) Both Assertion and Reason are false.Sol : www.cbse.site/sc/hm160To Purchase Hard Book of From Amazon Click Here.For More Details Whatsapp at 8905629969
For Answer and Explanation Question Click the Link in Pink Color.Page 230 Human Eye and Colourfull World61. Assertion : The stars twinkle while theplanet do not.Reason : The stars are much lesser in sizethan the planets.(a) Both Assertion and Reason are trueand Reason is the correct explanationof Assertion.(b) Both Assertion and Reason aretrue but Reason is not the correctexplanation of Assertion.(c) Assertion is true but Reason is false.(d) Assertion is false but Reason is true.Sol : www.cbse.site/sc/hm16162. Assertion : Blue colour of sky appears dueto scattering of blue colour.Reason : Blue colour has longest wavelength in visible spectrum.(a) Both Assertion and Reason are trueand Reason is the correct explanationof Assertion.(b) Both Assertion and Reason aretrue but Reason is not the correctexplanation of Assertion.(c) Assertion is true but Reason is false.(d) Assertion is false but Reason is true.Sol : www.cbse.site/sc/hm16263. Assertion : The light of violet colourdeviates the least and the light of red colourthe most, while passing through a prism.Reason : For a prism material, refractiveindex is highest for red light and lowest forthe violet light.(a) Both Assertion and Reason are trueand Reason is the correct explanationof Assertion.(b) Both Assertion and Reason aretrue but Reason is not the correctexplanation of Assertion.(c) Assertion is true but Reason is false.Chap 7(d) Assertion is false but Reason is true.Sol : www.cbse.site/sc/hm16364. Assertion : Sunlight reaches us withoutdispersion in the form of white light andnot as its components.Reason : Dispersion takes place due tovariation of refractive index for differentwavelength but in vacuum the speed oflight is independent of wavelength andhence vacuum is a non-dispersive medium.(a) Both Assertion and Reason are trueand Reason is the correct explanationof Assertion.(b) Both Assertion and Reason aretrue but Reason is not the correctexplanation of Assertion.(c) Assertion is true but Reason is false.(d) Assertion is false but Reason is true.Sol : www.cbse.site/sc/hm16465. Assertion : In case of rainbow, light atthe inner surface of the water drop getsinternally reflected.Reason : The angle between the refractedray and normal to the drop surface isgreater than the critical angle.(a) Both Assertion and Reason are trueand Reason is the correct explanationof Assertion.(b) Both Assertion and Reason aretrue but Reason is not the correctexplanation of Assertion.(c) Assertion is true but Reason is false.(d) Assertion is false but Reason is true.Sol : www.cbse.site/sc/hm16566. Assertion : Secondary rainbow is fainterthan primary rainbow.Reason : Secondary rainbow formation isTo Purchase Hard Book of From Amazon Click Here.For More Details Whatsapp at 8905629969
This PDF is review version of hard book available on Amazon. In hard book full explanation are given with question.Chap 7 Human Eye and Colourfull World Page 231three step process and hence, the intensityof light is reduced at the second reflectioninside the rain drop.(a) Both Assertion and Reason are trueand Reason is the correct explanationof Assertion.(b) Both Assertion and Reason aretrue but Reason is not the correctexplanation of Assertion.(c) Assertion is true but Reason is false.(d) Assertion is false but Reason is true.wondered how this happen so. Suddenly,they saw two hunters. They immediatelywent to the nearest police station tocomplain about them. Police immediatelywith their force went to the forest to arrestthose people. The effect they observed inthe canopy of the dense forest is:(a) Reflection(b) Refraction(c) Total internal reflection(d) Tyndall effectSol : www.cbse.site/sc/hm166Sol : www.cbse.site/sc/hm168 Direction For Questions(60-74) competencyBASED QUESTION67. Four friends went to a picnic. The weatherwas pleasant. They played various gamesand then had snacks. Suddenly, Shyam, oneof them, noticed seven colours in the sky.He said to others, “Wow, what a rainbow!”Then Ram, one of them, asked him “Whatis Rainbow”? He then explained to allabout its formation. After that everyone inthe group thanked him for the knowledge,he had given to them.The device can be used to obtain suchphenomenon is:(a) Lens(b) Mirror(c) Prism(d) Glass plateSol : www.cbse.site/sc/hm167Refer to the path of rays of light througha glass prism. Now answer the followingquestions.69. A glass prism has(a) six rectangular surfaces(b) four rectangular surfaces(c) two triangular bases andrectangular surfaces(d) none of the above.threeSol : www.cbse.site/sc/hm16968. Four friends went to a forest for a picnic.When they were moving around the forest,they saw that the light was filtering fromthe leaves of the trees. The path of the lightbeam becomes visible to all of them. They70. In passing through a glass prism, a ray oflight undergoes how many refractions?(a) OneTo Purchase Hard Book of From Amazon Click Here.For More Details Whatsapp at 8905629969
For Answer and Explanation Question Click the Link in Pink Color.Page 232 Human Eye and Colourfull World Direction For Questions(75-76)(b) Two(c) Three(d) FourSol : www.cbse.site/sc/hm16971. Two refractions on passing through theprism occur at(a) E and A(b) E and B(c) A and B(d) E and FSol : www.cbse.site/sc/hm16972. Angle of deviation is(a) MLF(b) FEO(c) LEF(d) none of theseSol : www.cbse.site/sc/hm16973. The(a)(b)(c)(d)Chap 7ray FRS isemergent rayrefracted rayincident raynone of theseA student done the following steps :1. Fix a sheet of white paper on a drawingboard using drawing pins.2. Place a glass prism on it in such a waythat it rests on its triangular base. Tracethe outline of the prism using a pencil.3. Draw a straight line PE inclined to oneof the refracting surfaces say AB , of theprism.4. Fix two pins say at points P and Q , onthe line PE as shown in Figure.5. Look for the images of the pins, fixed atP and Q , through the other face AC .6. Fix two more pins, at points R and S,such that the pins at R and S and theimages of the pins at P and Q lie on thesame straight line.7. Remove the pins and the glass prism.8. The line PE meets the boundary ofthe prism at point E (see figure below)Similarly, join and produce the points Rand S . Let these line meet the boundaryof the prism at E and F , respectively.Join E and F .9. Draw perpendiculars to the refractingsurfaces A
To Purchase Hard Book of From Amazon Click Here. For More Details Whatsapp at 8905629969 f a e q C l p C ChAptER 7 The cuman Eye and Colourful World S SmmARy . suffered by light ray due to refraction at the glass prism. 7.3 dispersion of light When a narrow beam of white light
