Numerical Aperture calculator
NA from acceptance angle, and relation to f/#.
Category: Imaging
Formula: NA = n·sin(θ) · N ≈ 1/(2·NA)
Inputs
| Input | Parameter | Unit | Default |
|---|---|---|---|
| Medium n | n | 1 | |
| Half-angle θ | th | ° | 15 |
Result with the default inputs
- NA: 0.2588
- Equiv. f/#: f/1.9319
Open it with your own values: put each input in the address as a parameter, for example /calculators/numerical-aperture?n=1. A unit other than the listed one goes in <parameter>_unit.
Read more: Wikipedia: Numerical aperture