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

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

`frac(2A)(mu)`

`muA`

`frac(muA)(2)`

`frac(A)(2mu)`

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