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

What is meant by the radius of curvature of a spherical mirror? How is it related to the focal length of the mirror?

Give one advantage of a spherical reflector over a plane reflector.

When a concave mirror produces a virtual and magnified image of an object,what is the object distance?

Rays from the Sun converge at a point $15 \, cm$ in front of a concave mirror. Where should an object be placed so that the size of its image is equal to the size of the object?

Name the type of mirror used in the following situation and support your answer with a reason:
$(a)$ Solar furnace