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A ray is incident at an angle of inciden...

A ray is incident at an angle of incidence i on one surfcae of a small angle prism (with angle of prism A) and emerges normally from opposite surface. If refractive index of material of prism is `mu` then the angle of incidence is nearly equal to

A

`(2A)/(mu)`

B

`mu A`

C

`(2A)/(2)`

D

`A/(2mu)`

Text Solution

Verified by Experts

The correct Answer is:
B

`r_2 = O`
`r_1 = A`
Apply snell.s law
`sin 1 = mu sin_1`
for small angle `(r_1 = A)`
`i= mu A`
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