Question

Find the maximum angle of refraction when a light ray is refracted from glass (μ = 1.50) to air.

Answer 1

Given,
Refractive index (μ) of the glass = 1.5
We know from the definition of a critical angle (θ_c) that if a refracted angle measures more than 90°, then total internal reflection takes place.
Hence, the maximum angle of refraction is 90°.