What is focal length of a concave mirror having radius of curvature 20 cm?

What is the focal length of a plane mirror ?

What is the focal length of a plane mirror?

Find the focal length of convex mirror whose radius of curvature is 32 cm.

Find the focal lengh of a convex miror and concave mirror each having radius of curvature of 20 cm.

An object is placed in front of a concave mirror of radius of curvature 40 cm at a distance of 10 cm.Find the position and magnification of the image.