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Solution


Q.

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R           [2023]

Assertion A: The phase difference of two light waves change if they travel through different media having same thickness, but different indices of refraction.

Reason R: The wavelengths of waves are different in different media.

In the light of the above statements, choose the most appropriate answer from the options given below:
1 Both A and R are correct but R is NOT the correct explanation of A  
2 A is correct but R is not correct  
3 Both A and R are correct and R is the correct explanation of A  
4 A is not correct but R is correct  

Ans.

(3)

As medium changes, optical path changes.

Also, Δxλ=Δϕ2π

Hence phase difference changes.