Question

A ray of light is incident on the hypotenuse of a right-angled prism after travelling parallel to the base inside the prism. If $\mu$ is the refractive index of the material of the prism, the maximum value of the base angle for which light is totally reflected from the hypotenuse is :

• A. $si{n}^{-1}\left(\frac{1}{\mu }\right)$
• B. $ta{n}^{-1}\left(\frac{1}{\mu }\right)$
• C. $si{n}^{-1}\left(\frac{\mu -1}{\mu }\right)$
• D. $co{s}^{-1}\left(\frac{1}{\mu }\right)$

Answer 1

Answer: (D)