A slide projector needs to create a 80 cm high image of a 2.0 cm tall slide. The screen is 280 cm from the slide. Assume that it is a thin lens. a)

A slide projector needs to create a 80 cm high image of a 2.0 cm tall slide. The screen is 280 cm from the slide. Assume that it is a thin lens.

a) What focal length does the lens need?

b) How far should you place the lens from the slide?