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Ray Optics and Optical Instruments
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Ray Optics and Optical Instruments
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25 Questions

1. A point source of light is placed 4 m below thesurface of water of refractive index 5/3 The minimumdiameter of a disc - which should be placed over thesource - on the surface of water to cut off all light comingout of water is [1994]
2. A biconvex lens has a radius of curvature ofmagnitude 20 cmWhich one of the following optionsbest describe the image formed of an object of height 2cm placed 30 cm from the lens?
3. An air bubble in a glass slab (u= 1.5) is 5 cm deepwhen viewed from one face and 2 cm deep when viewedfrom the opposite faceThe thickness of the slab is[2000]
4. Rainbow is formed due to a combination of [2000]
5. Focal length of a convex lens of refractive index1.5 is 2 cmFocal length of the lens when immersed in aliquid of refractive index of 1.25 will be [1988]
6. The radius of curvature of a thin plano-convex lensis 10 cm (of curved surface) and the refractive index is1.5If the plane surface is silvered - then it behaves like aconcave mirror of focal length
7. The refractive index of the material of a prism isroot2 and its refracting angle is 30°One of therefracting surfaces of the prism is made a mirrorinwardsAbeam of monochromatic light enters theprism from the mirrored surface if its angle of incidenceof the prism is [2004]
8. For a normal eye - the cornea of eye provides aconverging power of 40Dand the least converging powerof the eye lens behind the cornea is 20DUsing thisinformation - the distance between the retina and the eyelens of the eye can be estimated to be [NEET2013]
9. The frequency of a light wave in a material is 2 ×1014 Hz and wavelength is 5000 ÅThe refractive indexof material will be [2007]
10. Wavelength of light of frequency 100 Hz [1999]
11. Which of the following is not due to total internalreflection? [2011]
12. Focal length of a convex lens will be maximum for[1994]
13. A person is six feet tallHow tall must a verticalmirror be if he is able to see his entire length?
14. The hypermetropia is a [1995]
15. Time taken by sunlight to pass through a window ofthickness 4 mm whose refractive index is 3/2 is [1993]
16. A convex lens of focal length 80 cm and a concavelens of focal length 50 cm are combined togetherWhatwill be their resulting power?
17. A ray of light travelling in a transparent medium ofrefractive index u - falls on a surface separating themedium from air at an angle of incidence ofFor which ofthe following value of u the ray can undergo totalinternal reflection? [2010]
18. A ray of light is incident at an angle of incidence - i - on one face of prism of angle A(assumed to be small)and emerges normally from the opposite faceIf therefractive index of the prism is P - the angle of incidenceis nearly equal to: [2012]
19. A convex lens and a concave lens - each havingsame focal length of 25 cm - are put in contact to form acombination of lensesThe power in diopters of thecombination is [2006]
20. A microscope is focused on a mark on a piece ofpaper and then a slab of glass of thickness 3 cm andrefractive index 1.5 is placed over the markHow shouldthe microscope be moved to get the mark in focus again?[2006]
21. A plano-convex lens is made of material ofrefractive index 1.6The radius of curvature of thecurved surface is 60 cmThe focal length of the lens is[1999]
22. The refractive index of the material of the prism isroot 3 then the angle of minimum deviation of the prismis [1999]
23. If two mirrors are kept inclined at 60° to eachother and a body is placed at the middle - then totalnumber of images formed is [1995]
24. A converging beam of rays is incident on adiverging lensHaving passed through the lens the raysintersect at a point 15 cm from the lens on the oppositesideIf the lens is removed the point where the raysmeet will move 5 cm closer to the lensThe focal lengthof the lens is [2011M]
25. One face of a rectangular glass plate 6 cm thick issilveredAn object held 8 cm in front of the first faceforms an image 12 cm behind the silvered faceTherefractive index of the glass is [1996]

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