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Question

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.

A
If both assertion and reason are true and reason is the correct explanation of assertion.
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B
If both assertion and reason are true and reason is not the correct explanation of assertion.
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C
If assertion is true but reason is false
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D
If both assertion and reason are false
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Solution

The correct option is D If both assertion and reason are false
When a light wave travel from a rarer to a denser medium, its speed decreases but energy carried by the wave remains constant. It depends on the amplitude of wave. The frequency also remains constant.

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