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Both calculators run independently — change the inputs on either side to compare results.

Numerical Aperture Calculator

Calculate the numerical aperture (NA) of an optical fiber from the refractive indices of its core and cladding. NA determines light-gathering ability and the maximum acceptance angle of the fiber.

Core Refractive Index

Cladding Refractive Index

Fill in the required fields to see your result.

Optics

Fresnel Reflection Calculator

Calculate the percentage of light reflected at an optical interface for s- or p-polarization using the Fresnel equations. Indispensable for anti-reflection coating design, laser optics, and photography filter analysis.

Refractive Index 1

Refractive Index 2

Incident Angle (degrees)

Polarization

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Key differences

	Numerical Aperture Calculator	Fresnel Reflection Calculator
Category	Optics	Optics
Inputs required	2	4
Result	Numerical Aperture	Reflectance (%)
What it does	Calculate the numerical aperture (NA) of an optical fiber from the refractive indices of its core and cladding. NA determines light-gathering ability and the maximum acceptance angle of the fiber.	Calculate the percentage of light reflected at an optical interface for s- or p-polarization using the Fresnel equations. Indispensable for anti-reflection coating design, laser optics, and photography filter analysis.