PRISM and ANGLE OF PRISM

 PRISM

Prism is a transparent retracting medium bounded by at least two plane surfaces inclined at a certain angle.

ANGLE OF PRISM

The angle between two retracting surfaces of a prism is called angle of prism.

ANGLE OF DEVIATION

The angle between the direction of incident ray and the emergent ray is called angle of deviation. 

The angle of deviation depends on

1. Angle of incidence. 

With the increase in the angle of incidence , the angle of deviation first decreases ,then reach a minimum value then it also increases.

2.Refractive index of the material of the prism.

With the increase in the refractive index angle of deviation increases.

3. Colour o wavelength  of light 

With the increase in wavelength of light used, the angle of deviation decreases . Red is deviated the least and violet the most. 

4. Angle of prism or thickness of the prism 

The angle of deviation increases with increase in the  the angle of  de prism.