# Minimum Deviation in a Triangular Prism

Physics

## example

### Refractive Index of Prism using the angle of minimum deviation

Example: If the angle of minimum deviation produced by an equilateral prism is 30 , then find the refractive index of material of prism.

Solution:
given,

=

## definition

### Minimum angle of deviation for a prism

At the minimum deviation , the refracted ray inside the prism becomes parallel to its base.
i.e
Then
and
where is the angle of incidence,
is the angle of emergence.
are the angles of refraction and is the angle of the prism.