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A small mirror is suspended by a thread as shown. A short pulse of monochromatic light rays is incident normally on the mirror and gets reflected. Which of the following is/are correct ?

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Mirror will start to oscillate

Wave length of reflected rays will be greater than that of incident rays

Wave length of reflected rays may be less than that of incident rays

Wave length of reflected rays may be equal to the wave length of incident rays

answer is A, B.

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Detailed Solution

A) Mirror oscillates as radiation exert pressure on the minor (transfers momentum)
B) Energy of reflected photon is less, because a part of incident photon energy is transferred to the mirror.

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