# NEET Physics Ray Optics and Optical Instruments Questions Solved

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) ${\mathrm{sin}}^{-1}\left(\frac{1}{\mu }\right)$                             (b) ${\mathrm{tan}}^{-1}\left(\frac{1}{\mu }\right)$

(c) ${\mathrm{sin}}^{-1}\left(\frac{\mu -1}{\mu }\right)$                         (d) ${\mathrm{cos}}^{-1}\left(\frac{1}{\mu }\right)$

(d) If $\alpha$ = maximum value of base angle for which light is totally reflected form hypotenuse.

$\left(90°-\alpha \right)$= C = minimum value of angle of incidence at hypotenuse for total

internal reflection

Difficulty Level:

• 23%
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• 34%
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