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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. The angular resolution of a 10 cm diametertelescope at a wavelength of 5000 Ã… is of the order of[2005]
2. 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]
3. A convex lens is dipped in a liquid whose refractiveindex is equal to the refractive index of the lensThen itsfocal length will [2003]
4. 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]
5. 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]
6. 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]
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. 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:
9. An astronomical telescope has a length of 44 cmand tenfold magnificationThe focal length of theobjective lens is [1997]
10. Wavelength of light of frequency 100 Hz [1999]
11. 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]
12. An achromatic combination of lenses is formed byjoining [1995]
13. 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]
14. 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]
15. 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
16. Rainbow is formed due to a combination of [2000]
17. 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]
18. 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]
19. 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
20. 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?
21. 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]
22. Time taken by sunlight to pass through a window ofthickness 4 mm whose refractive index is 3/2 is [1993]
23. A person is six feet tallHow tall must a verticalmirror be if he is able to see his entire length?
24. 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]
25. The hypermetropia is a [1995]

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