In a concave mirror, an object is placed at a distance `d_1` from the focus and the real image is formed aat a distance `d_2` from the focus. Then the focal length of the mirror is :

In a concave mirror experiment, an object is placed at a distance x, from, the focus and the image is formed at a distance x_2 from the focus. The focal length of the mirror would be

In a concave mirror experiment, an object is placed at a distance x_(1) from the focus and the image is formed at a distance x_(2) from the focus. The focus length of the mirror would be

An object is placed at a distance X_1 from the focus of a concave mirror, Its real image is formed at a distance X_2 from the focus, Show that the focal length of the mirror is sqrt(x_1x_2)

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