The image formed by a convex mirror is always virtual.

Concave mirrors are used in street lights.

A plane mirror always produces an image that is _____.

If you stand $2 \mathrm{m}$ away from a plane mirror, the distance between you and your image is _____.

A _____ mirror produces an erect, diminished virtual image.

The focal length of a concave mirror is $15 \mathrm{cm}$. The radius of curvature is _____.

The radius of curvature of a concave mirror is $40 \mathrm{cm}$, its focal length is _____.

The image formed by a concave lens is always _____.

A convex lens can not produce a/an _____.