Page 44 - cbse-class-10-light-reflection-and-refraction

The incident ray is represented by TP.

The refracted ray is represented by PO.

And OR denotes the emergent ray that is bent towards the bottom.

Let PN and ON represent the normals at P and O, respectively.

Let I be the incidence angle and r be the refraction angle.

If the incident ray TP is extended forward and the emergent ray RO is extended
backwards, they will intersect at M, forming the angle OML.

OML is the angle measured. This angle is referred to as the angle of deviation.

The angle of deviation of an incident ray is the angle through which it deviates.
This should be repeated for different angles of incidence.

Dispersion of White Light by a Glass Prism

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