Question: When a light ray passes through a triangular prism and the angle of incidence (k) equals the angle of emergence \((\alpha)\), then the index of refraction \((\mu)\) is:

\(\mu=\frac{\sin \left[\frac{A+D}{2}\right]}{\sin \left[\frac{A}{2}\right]}\)

Show that when \(A=D\); \(\mu=\sqrt{2+2 \cos A}\)

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