CBSE Class 12 Physics Prism Deviation and Disprtion Theory and Examples

CBSE Class 12 Physics Prism Deviation and Disprtion Theory and Examples. Please refer to the examination notes which you can use for preparing and revising for exams. These notes will help you to revise the concepts quickly and get good marks.

1. DEVIATION

1.1 PRISM :
It is a transparent medium whose refracting surfaces are not parallel but are inclined to each other.

1.2 TERMS RELATED TO PRISM :
(A) Angle of Prism or Refracting Angle (A) : It is the angle between the faces on which light is incident and from which it emerges.

1.4 CRITICAL ANGLE :
It is the angle of prism above which incident light ray on first surface will not emerge out from the second surface for all possible values of angle of incidence

Note :The light will emerge out of a give n prism only if the angle of incidence is greater than the condition of grazing emergence.

1.6 CONDITION OF MAXIMUM DEVIATION :

Note :This situation is reverse of grazing emergence and may also be viewed as deviation at grazing incidence .

1.7 CONDITION FOR MINIMUM DEVIATION

Note: In the condition of minimum deviation the light ray passes through the prism symmetrically, i.e., the light ray in the prism becomes parallel to its base.

PROOF

We know, δ + A = i + e

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