Question

State whether true or false :

The degree of convergence of divergence of light rays achieved by a lens is expressed in terms of its power.

• A. True
• B. False

Answer 1

The correct option is A True

True

Whenever a ray of light passes through a lens (except when it passes through the optical center) it bends. The bending of light rays towards the principal axis is called convergence and bending of light rays away from the principal axis is called divergence. The degree of convergence or divergence of a lens is expressed in terms of its power. A lens of short focal length deviates the rays more while a lens of large focal length deviates the rays less. Thus power of a lens is defined as the reciprocal of its focal length.