19%20-%20Ray%20Optics

# 19%20-%20Ray%20Optics - 19 - RAY OPTICS Page 1 ( Answers at...

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19 - RAY OPTICS Page 1 ( Answers at the end of all questions ) 1 ) A fish looking up through the water sees the outside world contained in a circular horizon. If the refractive index of water is 4 / 3 and the fish is 12 cm below the surface, the radius of this circle in cm is ( a ) 7 36 / ( b ) 7 36 ( c ) 5 4 ( d ) 5 36 / [ AIEEE 2005 ] 2 ) A thin glass ( refractive index 1.5 ) lens has optical power - 5 D in air. Its optical power in a liquid medium with refractive index 1.6 will be ( a ) - 1 D ( b ) 1 D ( c ) - 25 D ( d ) 25 D [ AIEEE 2005 ] 3 ) A light ray is incident perpendicular to one face of a 90 ° prism and is totally internally reflected at the glass-air interface. If the angle of reflection is 45 ° , we conclude that the refractive index, n: ( a ) n < 1 / √ 2 ( b ) n > 2 ( c ) n > 1 / √ 2 ( d ) n < 2 [ AIEEE 2004 ] 4 ) A plano-convex lens of refractive index 1.5 and radius of curvature 30 cm is silvered at the curved surface. Now this lens has been used to form the image of an object. At what distance from this lens, an object be placed in order to have a real image of the size of the object ? ( a ) 20 cm ( b ) 30 cm ( c ) 60 cm ( d ) 80 cm [ AIEEE 2004 ] 5 ) To get three images of a single object, one should have two plane mirrors at an angle of ( a ) 30 ° ( b ) 60 ° ( c ) 90 ° ( d ) 120 ° [ AIEEE 2003 ] 6 ) The image formed by an objective of a compound microscope is ( a ) real and enlarged ( b ) virtual and enlarged ( c ) real and diminished ( d ) virtual and diminished [ AIEEE 2003 ] 7 ) A candle placed 23 cm from a lens, forms an image on a screen placed 75 cm on the other end of the lens. The focal length and type of the lens should be ( a ) + 18.75 cm and convex lens ( b ) - 18.75 cm and concave lens ( c ) + 20.25 cm and convex lens ( d ) - 20.25 cm and concave lens [ AIEEE 2003 ] 8 ) A person having the nearest distance of distinct vision of 32 cm uses a reading lens of 8 cm focal length. The magnification of his reading lens is ( a ) 5 ( b ) 4 ( c ) 3 ( d ) 2 [ AIEEE 2002] 9 ) Consider telecommunication through optical fibres. Which of the following statements is not true ? ( a ) Optical fibres can be of graded refractive index. ( b ) Optical fibres have extremely low transmission loss. ( c ) Optical fibres are subject to electromagnetic interference from outside. ( d ) Optical fibres may have homogeneous core with a suitable cladding. [ AIEEE 2002 ] 10 ) A ray of light passing through a prism having µ = 2 suffers minimum deviation. If angle of incidence is double the angle of refraction within prism, the angle of prism is ( a ) 30 ° ( b ) 45 ° ( c ) 60 ° ( d ) 90 ° [ AIEEE 2002 ]

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19 - RAY OPTICS Page 2 ( Answers at the end of all questions ) 11 ) The combined power of two lenses in contact is + 10 D. When they are separated by 20 cm, their power becomes + 6.25 D. The powers of these lenses are ( a ) - 3.5 D, + 6.5 D ( b ) - 7.5 D, + 2.5 D ( c ) + 7.5 D, + 2.5 D ( d ) + 9.0 D, + 1.0 D [ AIEEE 2002 ]
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## This note was uploaded on 11/28/2011 for the course PHYSICS 300 taught by Professor Smith during the Spring '06 term at ITT Tech Flint.

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19%20-%20Ray%20Optics - 19 - RAY OPTICS Page 1 ( Answers at...

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