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Ray Optics and Optical Instruments
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Ray Optics and Optical Instruments
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1. A beam of light composed of red and green rays isincident obliquely at a point on the face of rectangularglass slabWhen coming out on the opposite parallelface - the red and green rays emerge from [2004]
2. 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]
3. The hypermetropia is a [1995]
4. A convex lens is dipped in a liquid whose refractiveindex is equal to the refractive index of the lensThen itsfocal length will [2003]
5. 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]
6. A rod of length 10 cm lies along the principal axisof a concave mirror of focal length 10 cm in such a waythat its end closer to the pole is 20 cm away from themirrorThe length of the image is: [2012M]
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. 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]
9. Two plane mirrors are inclined at 70°A rayincident on one mirror at angle θ after reflection falls onsecond mirror and is reflected from there parallel to firstmirrorThe value of θ is[NEETKar2013]
10. 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]
11. Wavelength of light of frequency 100 Hz [1999]
12. 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]
13. 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]
14. For the angle of minimum deviation of a prism tobe equal to its refracting angle - the prism must be madeof a material whose refractive index:
15. A person is six feet tallHow tall must a verticalmirror be if he is able to see his entire length?
16. 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]
17. Ray optics is valid - when characteristic dimensionsare [1989]
18. Time taken by sunlight to pass through a window ofthickness 4 mm whose refractive index is 3/2 is [1993]
19. 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]
20. 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]
21. The frequency of a light wave in a material is 2 ×1014 Hz and wavelength is 5000 ÅThe refractive indexof material will be [2007]
22. The magnifying power of a telescope is 9When itis adjusted for parallel rays the distance between theobjective and eyepiece is 20 cmThe focal length oflenses are:2012
23. Rainbow is formed due to a combination of [2000]
24. The angular resolution of a 10 cm diametertelescope at a wavelength of 5000 Ã… is of the order of[2005]
25. Which of the following is not due to total internalreflection? [2011]

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