An object is placed at a distance x from the principal focus of a spherical mirror of focal length f. The magnification of the image will be

If the object distance and image distance from the focus of a spherical mirror of focal length f be x and y respectively, then

The magnificationof the image when an object is placed at a distance x from the principle focus of a mirror of focal length f is

The focal length of a concave mirror is f. A point object is placed at a distance of xf on the right side of the focus. The magnification of the image will be

An object is placed at a distance f in the front of a convex mirror. If focal length of the mirror is f, then distance of image from pole of the mirror is

An object is placed at a distance f in the front of a convex mirror. If focal length of the mirror is f, then distance of image from pole of the mirror is

An object is placed at a distance x_1 from the principal focus of a lens and its real image is formed at a distance x_2 from the another principal focus. The focal length of the lens is