[" In a concave mirror if `(x_(1))` and `(x_(2))` are the distances of object and its image respectively from the focus, then the focal length of the mirror is:

The distance of an object from a spherical mirror is equal to the focal length of the mirror. Then the image:

The distance of an object from a spherical mirror is equal to the focal length of the mirror. Then the image:

The distance of an object from a spherical mirror is equal to the focal length of the mirror. Then the image.

The distance of an object from a concave spherical mirror is equal to the focal length of the mirror. Then the image.

In a concave mirror, an object is placed at a distance d_1 from the focus and the real image is formed aat a distance d_2 from the focus. Then the focal length of the mirror is :

In a concave mirror, an object is placed at a distance d_1 from the focus and the real image is formed aat a distance d_2 from the focus. Then the focal length of the mirror is :

In an experiment to find the focal length of a concave mirror, an object is placed at a distance of 40 cm from it and forms image at 24 cm from the mirror, then the focal length is

A point object is placed on the axis of the concave mirror at a distance of 60 cm from the focal point of the mirror. Its image is formed at the point of object then focal length of the mirror is