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A light ray travelling in a medium of re...

A light ray travelling in a medium of refractive index `mu_(1)` is incident on a parallel faced glass slab making an angle of `theta` with the glass surface. The refractive index of the medium on the other side of the glass slab is `mu_(3) ( gt mu_(1))`. Find the angular deviation suffered by the light ray.

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The correct Answer is:
`delta = (pi)/(2) - theta - sin^(-1) ((mu_(1))/(mu_(3)) cos theta)`
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