Question

define focal length​

Answer 1

Answer:

distance between pole and focus is known as focal length.

Answer 2

$\huge{\underline{\underline{\mathfrak{Thank you}}}}$

FOCAL LENGTH

The distance between pole and principal focus of a spherical mirror is called its focal length. it is represented by f .

______________________________________

$\huge{\underline{\underline{\mathfrak{Thank you}}}}$