A ray is incident at an angle of incidence i on one
surface of a small angle prism (with angle of prism
A) and emerges normally from the opposite surface.
If the refractive index of the material of the prism
is µ, then the angle of incidence is nearly equal
to :
(1)
``\frac{A}{2µ}``
(2) ``\frac{2A}{µ}``
(3) µA
(4)``\frac{µA}{2}``