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Let the refractive index of a denser med...

Let the refractive index of a denser medium with respect to a rarer medium be `n_(12)` and its critical angle be `theta_(c)`. At an angle of incidence A when light is travelling from denser medium to rarer medium, a part of the light is reflected and the rest is refracted and the angle between reflected and refracted rays is `90^(@)`, Angle A given by -

A

tan A = sin `theta_c`

B

`sec A = cos theta_c`

C

`sin A = tan theta_c`

D

`cos A = sec theta_c`

Text Solution

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The correct Answer is:
A
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