A 5.0 diopter lens forms a virtual image which is 4 times the object placed perpendicularly on the principal axis of the lens. Find the distance of the object from the lens.

A 2.5 dipote lens forms a virtual image which is 4 times the object placed perpendicually on the principle axis of the lens. Find the required distance of the object form the lens.

A converging lens can from a virtual image if the object is placed

A convex lens forms a virtual image of an object placed ………… .

An object of height 5 cm is placed perpendicular to the principal axis of a concave lens of focal length 10 cm. If the distance of the object from the optical centre of the lens is 20 cm. Position, nature and size of the image formed.

A convex lens form a real image of a point object placed on its principal axis. If the upper half of the lens is painted black, the image will