Question

Why is the angle of incidence equal to the angle of emergence for muliple refraction media?

Answer 1

When the angle of refraction is equalto 90°, the angle of incidence is called the critical angle, At any angle of incidence greater than the criticalangle, the light cannot pass through the surface - it is all reflected. Total because all of the energy is reflected

Answer 2

In both cases the angle of incidence equals the angle of reflection at the point that the light ray strikes the surface. Light is also reflected when it is incident on a surface or interface between two different materials such as the surface between air and water, or glass and water.

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