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
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
- (A)Both and are correct but is NOT the correct explanation of
- (B) is correct but is not correct
- (C)Both and are correct and is the correct explanation of ✓ Correct
- (D) is not correct but is correct
Answer: (C)
Solution
The phase gained by a wave crossing a thickness of a medium is , where is the wavelength inside that medium. For equal thicknesses but different refractive indices the wavelengths differ, so the phases accumulated differ and the phase difference between the two waves changes. Both the assertion and the reason are correct, and the reason correctly explains the assertion.
JEE Main · 2023 · 06 Apr 2023 · Shift 2 · Single correct option