At what position will an object be placed in front of a concave mirror in order to obtain an image at infinity?

A. At the pole of the mirror
B. At the principal focus
C. at the center of the curvature
D. Between the principal focus and the center of curvature

Correct Answer:

Option B – At the principal focus

Explanation

For a concave mirror to produce an image at infinity, the image has to be placed at the principal focus of the mirror