A concave mirror gives a real image magnifies 4 times. When the object is moved 3 cm the magnification of the real image is 3 times. Find the focal length of mirror.

A concave mirror forms an image of an object, magnified 4 times. When the object is moved through 5 cm along the axis of the mirror, the magnification of the image is 5. What is the focal length of the mirror?

An object placed in front of a concave mirror at a distance of x cm from the pole gives a 3 times magnified real image. If it is moved to a distance of (x+5) cm, the magnification of the image becomes 2. The focal length of the mirror is

An object placed in front of a concave mirror at a distance of x cm from the pole gives a 3 times magnified real image. If it is moved to a distance of (x+5) cm, the magnification of the image becomes 2 . The focal length of the mirror is

A concave mirror forms a real image of an object placed in front of it at a distance 30 cm, of size three times the size of object. Find the focal length of mirror.

A concave mirros forms a real image magnified two times. If both the object and the screen are moved a real image magnified three times of the object is formed. If the screen is moved through a distance of 25 cm , then determine the displacement of the object and focal lenght of the mirror.

A concave mirror gives an image three times as large as the object placed at a distance of 20 cm from it . For the image to be real , the focal length should be-