The focal length of a plane mirror is $.....$

$A$ 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

$A$ child is standing in front of a magic mirror. She finds the image of her head bigger, the middle portion of her body of the same size, and that of the legs smaller. What is the order of combinations for the magic mirror from the top?

How will you decide whether a given piece of glass is a convex lens,concave lens or a plane glass plate?

Explain why drivers prefer to use a convex mirror as a rearview mirror in automobiles.

Under which of the following conditions can a concave mirror form an image larger than the actual object?