The distance between the pole of the spherical mirror and its focal point ( $F$ ) is called ____.

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Detailed Solution

The distance between the pole of the spherical mirror and its focal point (

F

) is called its focal length.
The focal length of a mirror is defined as the distance between the pole of the spherical mirror and its focal point (

F

), or it is the distance over which a ray from an infinite distance converges to a point on an optic axis. It is used to determine how much zoomed-in photos may look.
Focal Length of Spherical Mirrors - Learn CBSE

Focal Length of Spherical Mirrors - Learn CBSE

The radius of curvature is observed to be equal to twice the focal length for spherical mirrors with small apertures. Hence

R = 2 f

.
Where

R

is the curvature’s radius, and

f

is the mirror’s focal length.

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