Optics & Waves
Intermediate

Mirror Equation

Focal length relation for curved mirrors.

Formula

1f=1do+1di\frac{1}{f} = \frac{1}{d_o} + \frac{1}{d_i}

Variables

fFocal length
d_oObject
d_iImage

Did You Know?

The mirror equation explains why a spoon shows you upside down on one side and right-way-up on the other.

mirroroptics