An unnumbered wall clock shows time $04: 25: 37$, where $1^{\mathrm{st}}$ term represents hours, $2^{\mathrm{nd}}$ represents minutes and the last term represents seconds. What time will its image in a plane mirror show?

An object and a plane mirror are as shown in the figure. Mirror is moved with velocity $V$ as shown. The velocity of image is:

A square $ABCD\mathit{ }$of side $1 \mathrm{mm}$ is kept at distance $15 \mathrm{cm}$ infront of the concave mirror as shown in the figure. The focal length of the mirror is $10 \mathrm{cm}$. The length of the perimeter of its image will be (nearly):

In the figure shown find the total magnification after two successive reflections first on$M_1$ and then on $M_2$.