Focal Length

\frac{1}{f} = \frac{1}{p} + \frac{1}{i}

$1/f = 1/p+1/i$

$p" Object Distance"$

$i" Image Distance"$

Tags

The Focal Length equation computes the distance between a lens and the focal point where:

( $p$ ) Object Distance
( $i$ ) Image Distance

Focal Length(f): The equation returns Focal Length(f) in meters. However, this can be automatically converted to other length units via the pull-down menu.