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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. Which of the following is not due to total internalreflection? [2011]
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. Wavelength of light of frequency 100 Hz [1999]
4. 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]
5. 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:
6. Focal length of a convex lens will be maximum for[1994]
7. 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]
8. When a biconvex lens of glass having refractiveindex 1.47 is dipped in a liquid - it acts as a plane sheet ofglassThis implies that the liquid must have refractiveindex[2012]
9. 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]
10. 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]
11. 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
12. The frequency of a light wave in a material is 2 ×1014 Hz and wavelength is 5000 ÅThe refractive indexof material will be [2007]
13. 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]
14. Time taken by sunlight to pass through a window ofthickness 4 mm whose refractive index is 3/2 is [1993]
15. The angular resolution of a 10 cm diametertelescope at a wavelength of 5000 Ã… is of the order of[2005]
16. Rainbow is formed due to a combination of [2000]
17. 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]
18. 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]
19. An astronomical telescope has a length of 44 cmand tenfold magnificationThe focal length of theobjective lens is [1997]
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. 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]
22. 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
23. 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]
24. An achromatic combination of lenses is formed byjoining [1995]
25. Ray optics is valid - when characteristic dimensionsare [1989]

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