Refraction, Glass Slab & Apparent Depth
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 changes 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
Show answer and solution
Answer: (d)
- In a medium , so different media give different wavelengths: R is true.
- Phase change over thickness is ; different give different phase changes, so the phase difference changes: A is true.
- This happens precisely because the wavelengths differ, so R explains A.
- So the answer is (d).