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Light is incident from glass (μ = 1.50) to water (μ = 1.33). Find the range of the angle of deviation for which there are two angles of incidence.
Refractive index of glass is
Refractive index of water is
Critical Angle=
According to the question:
There will be two angles of incidence:
(1) When light ray passes through the normal
Angle of incidence =
Angle of refraction=
Angle of deviation =
(2) When light ray incident at critical angle
(As light ray is passing from glass to water)
⇒
⇒
⇒
⇒ Angle of deviation=
=
=
If angle of incidence increases beyond critical angle, total internal reflection will occur. So, the range of angle of deviation is