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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

Snell's Law Refraction Calculator

Calculate the refraction angle when light passes between two media using Snell's Law. Use it in optics coursework, lens design, or to find the critical angle for total internal reflection.

Incident Angle (degrees)

First Medium Refractive Index

Second Medium Refractive Index

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Key differences

	Fresnel Reflection Calculator	Snell's Law Refraction Calculator
Category	Optics	Optics
Inputs required	4	3
Result	Reflectance (%)	Refracted Angle (degrees)
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 refraction angle when light passes between two media using Snell's Law. Use it in optics coursework, lens design, or to find the critical angle for total internal reflection.