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Question

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

A
Will remain unchanged
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B
Will decrease
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C
Will increase
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D
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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