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A cubical block of glass of refractive i...

A cubical block of glass of refractive index `n_1` is in contact with the surface of water of refractive index `n_2.` A beam of light is incident on vertical face of the block. After refraction a total internal reflection at the base and refraction at the opposite face take place. The ray emerges at angle `theta` as shown. The value of `theta` is given by

Text Solution

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The correct Answer is:
`sin theta lt sqrt(n_(1)^(2)-n_(2)^(2))`
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