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Solution


Q.

Assertion: There exist two angles of incidence for the same magnitude of deviation (except minimum deviation) by a prism kept in the air.
Reason: In a prism kept in air, a ray is incident on the first surface and emerges out of the second surface. Now, if another ray is incident on the second surface (or prism) along the previous emergent ray, then this ray emerges out of the first surface along the previous incident ray. This phenomenon is called the principle of reversibility of light.
1 Both assertion and reason are correct and reason is the correct explanation of assertion.  
2 Both assertion and reason are correct but reason is not the correct explanation of assertion.  
3 Assertion is true, but reason is false.  
4 Assertion is false, but reason is true.  

Ans.

(1)

When a prism is kept in air, then two angles of incidence will exist for the same magnitude of deviation. This is due to the principle of reversibility of light. Thus, both assertion and reason are correct and reason is the correct explanation of assertion.