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A ray incident on the face of a prism is...

A ray incident on the face of a prism is refracted and escape through an adjacent face. What is the maximum permissible angle of the prism, if it is made of glass with a refractive index of `mu=1.5`?

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The correct Answer is:
A, D
Condition of no emergence is,
`Agt2 theta_C`
`:. A_(max)=2 theta_C=2 sin^-1(1/1.5)`
`=84^@`
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