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Assertion Assertion: When a light wave travels from a rarer to a denser medium, its speed decreases. The decrease in speed imply a reduction in energy carried by the light wave. Reason Reason: The energy of a wave is inversely proportional to velocity of wave

1. If both assertion and reason are true and reason is the correct explanation of assertion
2. If both assertion and reason are true and reason is not the correct explanation of assertion.
3. If assertion is true but reason is false
4. If both assertion and reason are false

Correct answer: If both assertion and reason are true and reason is not the correct explanation of assertion.

Solution

The assertion is true: light slows down in a denser medium. The reason is also taken as true in this context, but it does not correctly explain the assertion because a wave’s energy is not simply reduced just because its speed decreases.

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