An object is placed 20 cm in front of a mirror is found to have image 15 cm (a) in front of it, (b) behind the mirror. Find the focal length of the mirror and the kind of mirror in each case.

An object placed 20 cm in front of a convex mirror is found to have an image 15cm behind the mirror. Find the focal length of the mirror.

When an object is placed at 75 cm in front of a concave mirror, the magnification produced by the mirror is ( - 0.5). Find the focal length of the mirror.

When an object is placed at 6 cm in front of a concave mirror, its virtual image is formed at 15 cm from the mirror. Find the focal length and radius of curvature of the mirror.

An object is placed in front of the mirror. But the image is found to be formed behind the mirror. The image is

A convex mirror produces a magnification of 1/3 when an object is placed at a distance of 60 cm in front of the mirror. Find the focal length of the mirror.

An object is placed at a distance of 15 cm from a spherical mirror and a real image is formed at a distance of 30 cm in front of the mirror. Find the focal length of the mirror. Also, identify the mirror.