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Solution


Q.

Study the following diagram and select the option having correctly marked angles:
1 ∠i, ∠A, ∠D  
2 ∠i, ∠r, ∠D  
3 ∠i, ∠e, ∠A  
4 ∠r, ∠e, ∠D  

Ans.

 (1)

It is clear from the ray diagram that ∠A, ∠i and ∠D are correctly marked. ∠A represents the angle of prism which is correctly marked. ∠D represents the angle of deviation which is formed between the emergent ray and incident ray. ∠i is the angle formed by the incident ray with the normal. Thus, the correctly marked angles are ∠i, ∠A and ∠D.