Question

A child walks towards a fixed plane mirror at a speed of 5 km $h^{-1}$. The velocity of the image with respect to mirror is -

• A. 5 km $h^{-1}$
• B. – 5 km $h^{-1}$
• C. 10 km $h^{-1}$
• D. – 10 km $h^{-1}$

Answer 1

The correct option is B

– 5 km $h^{-1}$

Given,
Object velocity = $5km{h}^{-1}$

We know for plane mirror,
Image velocity w.r.t mirror = - (object velocity w.r.t to mirror)

Thus,
Image velocity = $-5km/h^{-1}$
Negative sign indicates that image will be moving left (or toward the mirror).