What is the magnitude of the critical angle for (a) Water- Air interface and (b) Glass- Air interface?

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Solution

(a) Magnitude of the critical angle for the water-air interface:- $49 °$
(b) Magnitude of the critical angle for the glass-air interface:- $42 °$
Critical angle: The critical angle is the angle of incidence, for which the angle of refraction is $90 °$ . If light enters a denser medium from a comparatively rarer medium, then the direction of light changes, and the light ray bends towards the normal.

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The critical angle for glass-air interface is :

(a) $24^{\circ}$ (b) $48^{\circ}$ (c) $42^{\circ}$ (d) $45^{\circ}$

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