a) Suppose that in an imaging system using a lens the focal

Last updated: 7/10/2022

a) Suppose that in an imaging system using a lens the focal length of the lens is 4cm and the image plane is a distance 8cm behind the lens. How far in front of the lens on the optical axis of the system must we place a point to get a perfect image of the point? b) If the lens diameter is 1cm and a point is placed at 10cm in front of the lens, what will be the diameter of the image of the point?