The magnification of a real image formed by a concave mirror is always ...

The figure below shows a point source of light $S$,a convex lens $L$,and a plane mirror $M$. The three are placed such that rays of light from $S$ return to it after reflection from $M$. $(i)$ What is the distance $OS$ called? $(ii)$ To which point (left of $S$,on $S$,or right of $S$) will the rays return if $M$ is moved to the left and brought in contact with $L$?

Which of the following is a part of a spherical mirror?

$A$ convex mirror has a focal length $f$. $A$ real object is placed at a distance $f$ in front of it. The mirror produces an image at

How will you identify a concave lens by touching it?

What is the relation between the radius of curvature $(R)$ and the focal length $(f)$ of a spherical mirror?