Question

What is the focal length of a spherical mirror?

Answer 1

The focal length of a spherical mirror.

1. The spherical mirror is a mirror whose surface is carved from a spherical shell.
2. The focal length of a spherical mirror is a parameter that is independent of the type of light employed. As a result, all lights are the same.
3. The focal length of a spherical mirror is defined as the distance from the primary focus to its pole.

For small-aperture mirrors the focal length will be:

$\mathrm{f}=\frac{\mathrm{R}}{2}$

Hence, the spherical mirror's focal length is the same for all lights.