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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 convex lens of focal length 80 cm and a concavelens of focal length 50 cm are combined togetherWhatwill be their resulting power?
2. 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
3. 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]
4. An achromatic combination of lenses is formed byjoining [1995]
5. 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]
6. 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]
7. 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]
8. Wavelength of light of frequency 100 Hz [1999]
9. There is a prism with refractive index equal to root 2and the refracting angle equal to 30°One of therefracting surfaces of the prism is polishedAbeam ofmonochromatic light will retrace its path if its angle ofincidence over the refracting surface of the prism is[1992]
10. 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]
11. 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]
12. Time taken by sunlight to pass through a window ofthickness 4 mm whose refractive index is 3/2 is [1993]
13. The frequency of a light wave in a material is 2 ×1014 Hz and wavelength is 5000 ÅThe refractive indexof material will be [2007]
14. 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]
15. An astronomical telescope has a length of 44 cmand tenfold magnificationThe focal length of theobjective lens is [1997]
16. A person is six feet tallHow tall must a verticalmirror be if he is able to see his entire length?
17. The refractive index of the material of the prism isroot 3 then the angle of minimum deviation of the prismis [1999]
18. 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:
19. 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?
20. A beam of monochromatic light is refracted fromvacuum into a medium of refractive index 1.5 - thewavelength of refracted light will be1991
21. A thin prism of angle 15° made of glass ofrefractive index µ 1 = 1.5 is combined with another prismof glass of refractive index µ 2 = 1.75The combination ofthe prism produces dispersion without deviationTheangle of the second prism should be [2011M]
22. Ray optics is valid - when characteristic dimensionsare [1989]
23. 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]
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. 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]

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