The image produced by a concave mirror is one-quarter the size of object. If the object is moved 5cm closer to the mirror, the image will only be half the size of the object. The focal length of 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.

The focal length of a concave mirror is 30 cm.Find the position of the object in front of the mirror,so that the image is there times the size of the objects.

The focal length of a concave mirror is 30 cm.Find the position of the object in front of the mirror,so that the image is three times the size of the objects.

The focal length of a concave mirror is 30 cm.Find the position of the object in front of the mirror,so that the image is three times the size of the objects.