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Find the maximum angle of refractive index

Question:

Find the maximum angle of refractive index when a light ray is refracted from glass $(\mu=1.50)$ to air.

Solution:

When light ray travels from glass to air then total internal reflection takes place. In this refracted angle is more than $90^{\circ}$ for reflection to occur. Thus, maximum angle is $90^{\circ}$.

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