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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 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]
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 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]
4. 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?
5. Rainbow is formed due to a combination of [2000]
6. A beam of monochromatic light is refracted fromvacuum into a medium of refractive index 1.5 - thewavelength of refracted light will be1991
7. 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]
8. Wavelength of light of frequency 100 Hz [1999]
9. An astronomical telescope has a length of 44 cmand tenfold magnificationThe focal length of theobjective lens is [1997]
10. A telescope has an objective lens of 10 cm diameterand is situated at a distance of one kilometer from twoobjectsThe minimum distance between these twoobjects - which can be resolved by the telescope - whenthe mean wavelength of light is 5000 Ã… - is of the order of
11. 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]
12. The hypermetropia is a [1995]
13. Which of the following is not due to total internalreflection? [2011]
14. A person is six feet tallHow tall must a verticalmirror be if he is able to see his entire length?
15. 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]
16. 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]
17. Time taken by sunlight to pass through a window ofthickness 4 mm whose refractive index is 3/2 is [1993]
18. 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]
19. 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]
20. A convex lens is dipped in a liquid whose refractiveindex is equal to the refractive index of the lensThen itsfocal length will [2003]
21. 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]
22. 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]
23. 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]
24. The refractive index of the material of the prism isroot 3 then the angle of minimum deviation of the prismis [1999]
25. A convex lens of focal length 80 cm and a concavelens of focal length 50 cm are combined togetherWhatwill be their resulting power?

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