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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

`i=alpha/2`
Divergent angle of emergent beam
`=2i=alpha`
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  10. Light passes through a glass slab with parallel sides and thickness t....

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  11. A ray of light is incident on a surface of glass slab at an angle 45^@...

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  12. Two transparent slabs have the same thickness as shown in figure. One ...

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  13. A ray of light is incident on the surface of a glass plate of thicknes...

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  14. Maximum lateral displacement of ray light incident on a slab of thickn...

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  15. Two optical media of refractive indices n1 and n2 contain x and y wave...

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  16. Refractive index of air is 1.0003. The correct thickness of air column...

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  17. If hat(i) denotes a unit vector along incident light ray, hat (r)a uni...

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