A converging lens is to projected image of a lamp 4 times the size of the lamp on a wall at a distance of `10m` from the lamp. The focal length of the lens is

A convex lens produces a real image m times the size of the object. What will be the distance of the object from the lens ?

The filament of lamp is 80 cm from a screen and a converging lens forms an image of it on a screen, magnified three times. Find the distance of the lens from the filament and the focal length of the lens.

A pin of length 2.0 cm lies along the principal axis of a converging lens, the centre being at a distance of 11 cm from the lens. The focal length of the lens is 6 cm. Find the size of the image.

A pin of length 2.0 cm lies along the principal axis of a converging lens, the centre being at a distance of 11 cm from the lens. The focal length of the lens is 6 cm. Find the size of the image.

A pin of length 2.0 cm lies along the principal axis of a converging lens, the centre being at a distance of 11 cm from the lens. The focal length of the lens is 6 cm. Find the size of the image.

A pin of length 1cm lies along the principle axis of a converging lens, the centre being at a distance of 5,5cm form the lens. The focal length of the lens is 3 cm . Find the size of the image.

A pin of length 1cm lies along the principle axis of a converging lens, the centre being at a distance of 5,5cm form the lens. The focal length of the lens is 3 cm . Find the size of the image.