# Refractive index

The light passes through the interface between air and glass with a refractive index of 1.5. Find:
(a) the angle of refraction if light strikes the interface from the air at an angle of 40°.
(b) the angle of refraction when light strikes the glass interface at an angle of 40°.
(c) the angle of incidence if the light is refracted at an angle of 20° on impact from the glass.
(d) cut-off angle (justify for which way the light passes through the interface)

Correct result:

A =  25.374 °
B =  74.6186 °
C =  30.8659 °
D =  41.8103 °

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