For a concave mirror the magnificant of a real image was found to be twice as greater when the object was 15 cm from the mirror as it was when the object was 20 cm from the mirror. The focal length mirror is

Using a certain concave mirror, the magnification is found to be 4 times as great when the object was 25 cm from the mirror as it was with the object at 40 cm from the mirror, the image, being real in each case.Find the focal length of the mirror.

The real image of an object placed at 60 cm from a concave Mirror is formed at 20 cm. from the mirror. Find the focal length of the mirror.

A concave mirror of focal length f produces a real image n times the size of the object. The distance of the object from the mirror is

An object is placed at a distance of 30 cm from a concave mirror and its real image is formed at a distance of 30 cm from the mirror. The focal length of the mirror is

An object is placed at a distance of 30 cm from a concave mirror and its real image is formed at a distance of 30 cm from the mirror. The focal length of the mirror is

An object at a distance of 30 cm from a concave mirror gets its image at the same point. The 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.