NA Calculator - DeepLightSeek

Popular Lens Mirror Prism Filter Dispersion Polarization Coating Optical Window

Tool Description

Numerical Aperture (NA) is a key parameter measuring the light-gathering ability of an optical system. NA = n × sin(θ), where n is the refractive index of the medium and θ is the half-cone angle. This tool supports forward calculation and inverse solving, with associated f-number and resolution.

Input Parameters

Calculation Mode

Medium

Half-cone angle θ (°)

f-number (f/#)

Numerical Aperture NA

Working Wavelength (nm)

Results

Numerical Aperture (NA)

—

Half-cone angle θ

—

f-number (f/#)

—

Abbe Resolution

—

Rayleigh Criterion

—

Depth of Focus DOF (±)

—

NA Diagram

Core Formulas

Numerical Aperture

NA = n × sin(θ)

NA and f/#

f/# ≈ 1 / (2 × NA)

Abbe Resolution

d = λ / (2 × NA)

Depth of Focus (half value)

DOF = ±λ / (2 × NA²)

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Resources

Tool Description

Input Parameters

Results

NA Diagram

Core Formulas

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