PhysRefPhysics reference
Optics
Optics

Focal Length and Radius

f=R2f = \frac{R}{2}

The focal length of a spherical mirror is half its radius of curvature.

Variables

f
Focal length
m
R
Radius of curvature
m

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Common questions

What is the Focal Length and Radius formula?

Focal Length and Radius is written f = R/2. The focal length of a spherical mirror is half its radius of curvature. It belongs to Optics, under Reflection.

What are the units in f = R/2?

In SI units, f is focal length, measured in m; R is radius of curvature, measured in m.