When a plane mirror is rotated by an angle $\theta$,the reflected ray turns by an angle $2\theta$. Is this statement true or false?

Beams of light are incident through the holes $A$ and $B$ and emerge out of the box through the holes $C$ and $D$ respectively,as shown in the figure. Which of the following could be inside the box?

The radius of curvature of a spherical mirror is half of the focal length.

The compound microscope consists of two convex lenses of $5 \, cm$ and $20 \, cm$ focal length. Which of them will be the objective and the eyepiece?

At what position should an object be placed in front of a concave mirror to obtain a magnification of $(- 2)$?

The magnification of a mirror is $+1$. What does it mean?