NA to f-Number Converter
Convert between Numerical Aperture and f-number for optical systems. Calculates half-angle, solid angle, and accounts for the refractive index of the medium.
Inputs
1.0 for air, 1.33 for water, 1.52 for oil immersion
Results
NA
0.5000
f-Number
f/0.87
Half-Angle
30.00°
NA / f-Number Results
| Parameter | Value |
|---|---|
| Numerical Aperture | 0.5000 |
| f-Number | f/0.87 |
| Half-Angle θ | 30.0000° |
| Solid Angle Ω | 0.841787 sr |
| Medium Index | 1.00 |
| Paraxial NA | 0.5774 |
| Formula | NA = n × sin(θ) |
Frequently Asked Questions
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