$A$ virtual,magnified and erect image can be formed by a concave mirror.

An object $3.0 \text{ cm}$ high is placed perpendicular to the principal axis of a concave lens of focal length $7.5 \text{ cm}$. The image is formed at a distance of $5.0 \text{ cm}$ from the lens. Calculate $(i)$ distance at which object is placed,and $(ii)$ size and nature of image formed.

What type of image is always formed by a concave lens?

$A$ convex mirror always forms a virtual and erect image.

If the radius of curvature of a spherical mirror is $30 \ cm$,what is its focal length (in $cm$)?

$A$ plane mirror can be used to form a real image equal in size as of the object.