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662, (Carrying 5, , 2 TYPE [B] ~, , , , \NSW, , Rolain the retattion anigneeamirea leva end 9 Explain election, write the basic cause of refraction of light Derive the the conditions for fr, , 4, Explain refraction of light w, , and it is vie, , Real depth, , relation, Apparent depth, , , , , refractive index and, , light,, © value of absolute, , reversibility of, dex. Gan th, , absolute refractive, , , , efractive index be lesser than 1?, , 0. A beaker, refractive, water of refr, depth of the be, , The refractive, he refractive index of diamond relative to air is 2.42 10, es light, , and shatob alas U2 How much faster do, , ATIVE aes indiamond? Ans. 1,60 times, , of light in air is incident on a glass plate at 45°, , 5. What is angle of, anes, tt, , face, , The refractive index of glass is 1, refraction?, , avon which is incident in air on the surf, alee lock is deviated through 15 The angle of 45, at nce i aici 60°. What is the angle of refraction ne, oe calculate the critical angle for glass air, eee (ISC 2002) Ans. 45°, 54.7°, ee will a 4 m deep tank appear when seen in, ae et ae refraction? The refractive index of 14., A beaker is filled w Eoece, ae ith water to a height of 12.5 cm., apparent depth of a needle at the bottom of the, , beaker is Fi, r is 9.4 cm. Find refractive index of water., Ans. 1.33, , The appare:, Tis spperennaene) of an object at the bottom of a, illed with a liquid of refractive index 1.3 is, , em, What is the actual depth? Ans. 10 cm., le lying on horizontal surface is viewed, , ae ay on a distance of 100 cm. A gle, one ae hickness is placed on the needle. Find the, Geen a he vertical image of the needle from the, goes Ziqn, = 15 Ans. 96 cm., 2 Tete focussed on a pin lying at the bottom of, aie ake: read 3.965 cm. When a liquid is poured up, epee g 537 cm into the beaker, the microscope, Eee pee reads 3.348 cm. Find the, see the liquid Ans. 1.321., The apparent depth of a needle fixed at the bottom of, the beaker is measured to be 10 cm by a microscope., What is the refractive index of the liquid? The height, of the liquid in the beaker is now raised to 21 cm., By what distance would the microscope have to be, moved to focus on the needle again? Ans. 1.4, 5,0 cm., , , , 13., , , , 15., , , , a, , , , , , , , , , , , , , , , denser, and obt, depth in te, Draw ray,, 180, , phenome, , , , Aray of ligh, n, , is critical angle for g], What is the critical, dense gla, dense glass, respectively., The absolute refracti, , are, for a ray travellin, , ‘An_ equilateral, , A small bulb is pl, , filled with a liquid to a height of 14cm. 18,, , , , , , , , edium, ain the, erms Of, , , , relation bet, refractive index, , eviate a Tay, diagram to de :, ster awitnoueeceen a, ‘and write its conditions, , , , of lightwy 70, , Name the, , , , , , , , and inver, non used, , , , =, 4 with an oil of, ie copper ole led, 3, What is the apparent, , d normally?, ‘Ans. 14.66 cm,, , glass prism, he ray just, Ans., yellow light, , half fille, , , , 20 cm high |s, index 1.40 and, active index 1.3:, , faker as observe, , on the face of @, rind the angle of the Prism if, , ge from the second face, Je of 45° for, , + falls normally, , , , = 1.5), , , , fails to emer he, , ‘A substance has a critical ang 0, What is the refractive index Of the substance, , ‘Ans. 1.414, , ‘The refractive index of glass relative to ait is 1.5. Wha, , airinterface? Ans. 41.8, , ass, angle for a light ray going fro, , Ter? The refractive indices «, to air are 1.62 and 1, , Ans. 55, , water and glycerin, d the critical ang!, , rine into water, , Ans. 65.5, , prism of glass of refractive inde, 14s is immersed in water of refractive index 1.33, , hat falls normally on one face of th, , narrow beam of lig, prism. Find the angle of emergence of the beam, Ans., , , , ss into wal, ‘and water relative, , , , , ive indices of, , 1.33 and 1.46 respectively., g from glyce!, , , , , , §, faced at the bottom of a tank, depth of 80 cm. What is the, ater through which light o, index of w, , containing water to a, , area of the surface of w, , the bulb can emerge out? Refractive, , 1.33, Consider the bulb to be a point-source, Ans., , is placed at the centre of, nde, , ater, , , , , , A point-source of light, bottom of a jar having a liquid of refractive i, 5/3. An opaque disc of radius 1.0 cm is placed «1, the liquid surface with its centre vertically above tte, source, What is the maximum height of the liquid!, , which the source is not visible from above?, Ans. 4/3.cm