JEE Mains · Physics · STD 12 - 9. Ray optics and optical instruments
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
- 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 & Solution
Correct Answer
(C) Both \(A\) and \(R\) are correct and \(R\) is the correct explanation of \(A\)
Step-by-step Solution
Detailed explanation
As medium changes, optical path changes. Also, \(\frac{\Delta x}{\lambda}=\frac{\Delta \phi}{2 \pi}\) Hence phase difference changes.
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