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Assertion A: The phase difference of two light waves changes if they travel through different media having same thickness, but different refractive indices.
Reason R: The wavelength of waves are different in different media.

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Both A and R are correct but is R is not the correct explain of A

A is correct but R is not correct

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

A is not correct but R is correct

answer is C.

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Detailed Solution

As medium changes, optical path changes.

$Δ x = t (μ - 1)$

Phase difference, $Δϕ = \frac{2 π}{λ} Δx = \frac{2 π}{λ} t (μ - 1)$

The phase difference of two light waves changes.

The wavelength of waves are different in different media.

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