Question

An object is appproaching a stationary plane mirror at $10\text{cm/s}$. A stationary observer sees the image. At what speed will the image approach the stationary observer?

• A. $10\text{cm/s}$
• B. $5\text{cm/s}$
• C. $20\text{cm/s}$
• D. $15\text{cm/s}$

Answer 1

The correct option is A $10\text{cm/s}$

As it is clear from Fig. the distance of image with reference to observer reduces by $10\text{cm}$ in one second.
$\therefore$ Speed of image with respect to stationary observer is $10\text{cm/s}$