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Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R 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 not correct but R is correct (3) A is correct but R is not correct (4) Both A and R are correct and R is the correct explanation of A

1. Both A and R are correct but R is NOT the correct explanation of A
2. A is not correct but R is correct
3. A is correct but R is not correct
4. Both A and R are correct and R is the correct explanation of A

Correct answer: Both A and R are correct and R is the correct explanation of A

Solution

Both statements are accurate because the phase difference does change when light waves pass through different media with varying refractive indices, and this is due to the change in wavelengths in those media, which directly affects the phase relationship.

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