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Question
Assertion: Frequency of light does not change during refraction.
Reason: No refraction occurs when light is incident normally on a boundary of two media.
Options
If both Assertion and Reason are true and the Reason is correct explanation of the Assertion.
If both Assertion and Reason are true, but Reason is not correct explanation of the Assertion.
If Assertion is true, but the Reason is false.
If Assertion is false, but the Reason is true.
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Solution
If both Assertion and Reason are true, but Reason is not correct explanation of the Assertion.
Explanation:
Frequency is an intrinsic property determined by the emitting source and does not change when crossing media boundaries. At normal incidence, light continues undeviated without bending. Both statements are true, but normal incidence does not explain frequency constancy.
