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A ray of light is incident normally on o...

A ray of light is incident normally on one face of `30^(@) - 60^(@) - 90^(@)` prism of refractive index 5/3 immersed in water of refractive index 4/3 as shown in figure .

A

The exit angle `theta_(2)` of the ray is `sin^(-1)(5//8)`

B

The exit angle `theta_(2)` of the ray is `sin^(-1)(5/4sqrt(3))`

C

Total internal reflection at point P ceases if the refractive index of water is increased to `5//2sqrt(3)` by dissolving some substance

D

Total internal reflection at point P P ceases if the refractive index of water is increased to 5/6 by dissolving some substance.

Text Solution

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The correct Answer is:
A, C
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