A light ray is incident at an angle of 45° with the normal to a √2 cm thick plate (μ = 2.0). Find the shift in the path of the light as it emerges out from the plate.
Angle of incidence 
Thickness of the plate = 
Refractive index of plate 
By Snell’s law:
BD is the shift in the path.
BD = AB
=
= 
1