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

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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Optics

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

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Key differences

	Fresnel Reflection Calculator	Numerical Aperture Calculator
Category	Optics	Optics
Inputs required	4	2
Result	Reflectance (%)	Numerical Aperture
What it does	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.	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.