Question

The line joining the two centres of curvature of a lens is called
a) Optic Centre B) Principal axis C) focus D) focal length​

Answer 1

Answer:

B) Principal axis

Explanation:

Optical axis, the straight line passing through the geometrical centre of a lens and joining the two centres of curvature of its surfaces. Sometimes the optical axis of a lens is called its principal axis.

Answer 2

Answer:

● The line joining the two centres of curvature of a lens is called Principle axis.