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

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

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

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?

An object is 2m from a lens which forms an erect image half (exactly) the size of the object. Determine the focal length of the lens. What type of lens is this?