The magnification produced by a spherical mirror and a spherical lens is + 0.8.

A concave lens produces an image 20 cm from the lens of an object placed 30 cm from the lens. The focal length of the lens is:

Only one of the following applies to a concave lens. This is:

The magnification produced by a spherical lens and a spherical mirror is+ 2.0.

A camera fitted with a lens of focal length 50 mm is being used to photograph a flower that is 5 cm in diameter. The flower is placed 20 cm in front of the camera lens.

(a) At what distance from the film should the lens be adjusted to obtain a sharp image of the flower?

(b) What would be the diameter of the image of the flower on the film?

(c) What is the nature of camera lens?