[" 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:

Assertion : In a concave mirror if X and Y are the distance of the oject and its image respectively from the focus then the focal length of the mirror is sqrt(xy) Reason : In above case (1)/(v ) + (1)(u) + (1)/(f ) reduces to (1)/( f+ x) + (1)/(f+ y) = (1)/(f ) rArr xy = f^(2)

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.

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 :

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

An object is placed in front of a concave mirror at a distance of 7.5 cm from it. If the real image is formed at a distance of 30 cm from the mirror, find the focal length of the mirror. What would be the focal length if the image is virtual.

The image of a distant object is formed at 30 cm from a concave mirror. What is the focal length of the mirror?

A convex mirror forms an image one-fourth the size of the object. If object is at a distance of 0.5 m from the mirror the focal length of the mirror is

When an object is at .distances of mu_(1) and mu_(2) from the poles of a concave mirror, images of the same size are formed. The - focal length, of the mirror is