Question

If an observer moves towards a plane mirror with a speed of 2 m/s, what is the speed of the image with respect to the observer?

Answer 1

4 m/s because their speed will be added

Answer 2

According to the question,

let the speed of the observer with respect to the mirror be S m/s

Let the speed of the image with respect to the mirror will be - S m/s

As given in the question,

S= 2 m/s

As we know,

the velocity of image($v_{i}$) = - velocity of the observer($v_{o}$)

The speed of the image with respect to the observer = $v_{i} - v_{o}$

⇒ 2 - (- 2)

⇒ 4 m/s

The speed of the image with respect to the observer is 4 m/s.

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