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A diverging beam of light from a point s...


A diverging beam of light from a point source S having devergence angle `alpha`, falls symmetrically on a glass slab as shown. The angles of incidence of the two extreme rays are equal. If the thickness of the glass slab is t and the refractive index n, then the divergence angle of the emergent beam is

A

zero

B

`alpha`

C

`sin^(-1)1/n`

D

`2sin^(-1)(1/n)`

Text Solution

Verified by Experts

The correct Answer is:
B
(b) Since, rays after passing through the glass slab just suffer lateral displacement. So, angle between emergent ray is also `alpha`.
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DC PANDEY ENGLISH-RAY OPTICS-Exercise
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  10. The power of a biconvex lens is 10 dioptre are the radius of the curva...

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  13. A ray of light falls on a denser-rarer boundary from denser side. The ...

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  15. If light travels a distance x in t(1) sec in air and 10x distance in t...

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  17. The focal lengths of the objective and eye- lens of a microscope are 1...

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  18. The graph between u and v for a convex mirrorr is

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  19. A concave lens of focal length 20 cm placed in contact with a plane mi...

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  20. A diver at a depth of 12 m in water (mu=4 //3) sees the sky in a cone ...

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