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Q.

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

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a

Both A and R are correct but R is NOT the correct explanation of A

b

A is correct but R is not correct

c

Both A and R are correct and R is the correct explanation of A

d

A is not correct but R is correct

answer is C.

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Detailed Solution

As medium changes, optical path changes.
From $Δϕ = \frac{2 π}{λ} Δx$
Hence phase difference changes

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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