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A ray of light is incident horizontally ...

A ray of light is incident horizontally on the face AB of the.right angled prism as shown in the figure. If the ray emerges grazing the surface AC, find the value of `phi`. Refractive index of the material of the prism is given to be n.

Text Solution

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`Sin theta_(c) = 1//n`
from the figure `pi//2 - theta_(c) = phi`
`implies theta_(c) = pi//2 - phi`
`implies phi = cos^(-1)(1//n)`
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