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Solution


Q.

Study the following ray diagram:

In this diagram, the angle of incidence, the angle of emergence and the angle of deviation respectively have been represented by:

 
1 y, p, z  
2 x, q, z  
3 p, y, z  
4 p, z, y  

Ans.

(3)

It is clear from the ray diagram that: The angle which is formed between the incident ray and the normal is called angle of incidence (p). The angle which is formed between emergent ray and the normal is called angle of emergence (y). The angle which is formed between the emergent ray and incident ray is called angle of deviation (z). Thus, angle of incidence, emergence and deviation is p, y and z respectively.