A convex lens of diameter D and foacal length f projects a small object at a great distance from the lens on to a secrrn. Calculate the illuminance of the image in terns of luminance L of the object diameter D and focal length f.

An object is situated at a distance of f//2 from a convex lens of focal length f Distance of image will be-

An object is placed at 0.06 m from a convex lens of focal length 0.1 m. Calculate the position of the image?

A convex lens of focal length 15 cm is placed on a plane mirror. An object is placed at 30 cm from the lens. The image is

A point object is placed at a distance of 12 cm from a convex lens of focal length 10 cm. On the other side of the lens, a convex mirror is placed at a distance of 10 cm from the lens such that the image formed by the combination coincides with the object itself. The focal length of the convex mirror is

A convex lens of focal length f produces a virtual image n times the size of the object. Then the distance of the object from the lens is