Question

3. The length of the straight line joining two opposite extreme points on the periphery of a
spherical mirror is called​

Answer 1

Answer:

principal section of a mirror is defined as distance between extreme points on the periphery of the mirror.

Explanation:

Answer 2

Answer:

Linear aperture

Explanation:

The length of the straight line joining two opposite extreme points on the periphery of a spherical mirror is called linear aperture.