The Principal Axis Is the

Multiple Choice

The principal axis is the

A) straight line drawn from the center of curvature to the mid point of the mirror.
B) straight line drawn from the center of curvature to any point of the mirror.
C) straight line drawn from the center of curvature to a point on the outer edge of the mirror.
D) straight line joining any two points on the mirror.
E) None of the other answers given is correct.