A real image formed by a concave mirror is 4.5 times the size of the object. If the mirror is 20 cm from the object, its focallength is

The real image formed by a concave mirror is smaller than the object if the object is :

The real image formed by a concave mirror is larger then the object when the object is :

The image formed by a concave mirror is twice the size of the object. The focal length of the mirror is 20 cm. The distance of the object from the mirror is//are

The image formed by a concave mirror is twice the size of the object. The focal length of the mirror is 20 cm. The distance of the object from the mirror is//are

The image (of a real object) formed by a concave mirror is twice the size of the object. The focal length of the mirror is 20cm. The distance of the object from the mirror is:

The image formed by a concave mirror is of the same size as the object if the object is placed ..........

A real image obtained by a concave mirror is 4 times bigger than the object. If the object is displaced by 3 cm away from the mirror, the image size becomes 3 times the object size. Find the focal length of the mirror.

Image formed by a concave mirror radius of curvature 40 cm is half the size of the object. Then distance of object and its image from the mirror will be -