Question: A light ray incident on a prism is refracted at the first surface, as shown in figure. Let Ñ represent the apex angle of the

A light ray incident on a prism is refracted at the first surface, as shown in figure. Let Ñ„ represent the apex angle of the prism and n its index of refraction. Find, in terms of n and Ñ„, the smallest allowed value of the angle of incidence at the first surface for which the refracted ray will not undergo total internal reflection at the secondsurface.
A light ray incident on a prism is refracted at

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