Focal length versus apparent magnification
Note that magnification as used in this document is not conformant to the optics definition
y =-0.11x + 5.08
Best fit relationship actually appears to be: f(x) = 75.85*(1/x)-0.96 r² = 1
Data table
Focal length (cm) | Apparent magnification |
18.5 | 3.20 |
20 | 2.80 |
23 | 2.30 |
34 | 1.30 |