Numerical Aperture Calculator
Compute NA = n sin θ (θ in degrees, half-angle).
Input Data
Input Medium index n.
Input Half-angle θ.
°
Results
0.75
NA = n sinθ = 0.750000
At a glance:Numerical Aperture Calculator: enter parameters to compute results; complements related calculators.
Formula
NA = n sin θ
θ: acceptance half-angle (degrees)
How to Use
- Enter medium index n.
- Enter acceptance half-angle θ (deg).
- Get numerical aperture NA.
Case Studies
n=1.5, θ=30°
NA = 1.5·sin30° = 0.75.
FAQ
Vs resolution?
Larger NA gives better resolution and brightness (see Abbe limit).
Related Tools
References
Content review: Calculatorism Science Team. Formula and numeric tests verified; results for reference only.