Question

A ray passing through the focus of a concave mirror after reflection is parallel to
a) pole
b) focus
c) centre of curvature
d) principal axis​

Answer 1

Answer:

d) principal axis

Explanation:

A ray passing through the focus of a concave mirror is parallel to the principal axis of the mirror.

So, you can say it's the reciprocal of principal focus

"The point where the rays of light parallel to the principal axis converge after reflecting is called its principal focus"