A lens of focal length f is used to project an image of a solar eclipse on a flat sheet of paper.Which of the following image distances gives the clearest image in this case?
A) f/2
B) f
C) 2f
D) more than 10f
E) less than f/10

Question

Quizplus · Accepted Answer

The clearest image is formed when the object is at infinity, which is the case for the sun during a solar eclipse. The image is formed at the focal length f of the lens.

A Lens of Focal Length F Is Used to Project