An object is moving with velocity v towards a stationary plane mirror. If mirror starts moving towards the object with speed v, the speed of the image of the object

Will remain unchanged

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Will decrease

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Will increase

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May remain unchanged

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Solution

The correct option is C Will increase
Velocity of object = v
Velocity of mirror = – v
Velocity of object relative to mirror = v – (– v) = 2v
For plane mirror, |velocity of object relative to mirror| = |velocity of image| = 2v
So, the velocity of image increases.
Hence, the correct answer is option (c).

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