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

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The wavelength of reflected rays will be greater than that of incident rays.

The wavelength of reflected rays may be less than that of incident rays

None of these

Mirror will start to oscillate.

answer is A, B.

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Detailed Solution

Reflection of light imparts momentum on the mirror, hence the mirror will start to oscillate.

Oscillating mirror gains energy from incident light, hence the reflected light will have less energy and greater wavelength compared to incident light.

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