An observer moves towards a stationary plane mirror at a speed of 4m/s speed, the speed at which his image moves towards him is?

The speed with which man is approaching the mirror is the same speed his image approaches the mirror.

An observer moves towards a stationary plane mirror at a speed of $v$ m/s speed, the speed at which his image moves towards the mirror is $v$ m/s.

So, the speed with which image approaches man is $2v$ m/s

Therefore, the speed at which his image moves towards him is $2 \times 4$ = 8 m/s.

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Updated on: 10-Oct-2022

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