Fresnel Reflection Calculator
Calculate Fresnel reflection and transmission coefficients for optical interfaces
About this calculator
The Fresnel Reflection Calculator computes the reflection and transmission coefficients at optical interfaces between different materials. Based on Fresnel equations, it determines how much light is reflected versus transmitted when electromagnetic waves encounter boundaries between media with different refractive indices. This tool is essential for optical engineers, physicists, and researchers designing lenses, coatings, fiber optics, and other photonic devices where controlling light behavior at interfaces is critical for performance optimization.
How to use
Enter the refractive indices of both materials and the angle of incidence of the incoming light beam. Select the polarization state (s-polarized, p-polarized, or unpolarized). The calculator will instantly compute the reflection and transmission coefficients, showing what percentage of light is reflected and transmitted at the interface.
Frequently asked questions
What is the difference between s and p polarized light?
S-polarized light has electric field perpendicular to the plane of incidence, while p-polarized light has electric field parallel to the plane of incidence.
What happens at Brewster's angle?
At Brewster's angle, p-polarized light experiences zero reflection and is completely transmitted, making it useful for polarizing applications.
Why do Fresnel coefficients matter in optics?
Fresnel coefficients determine optical losses, reflections, and transmission efficiency in lenses, coatings, and optical systems, directly affecting performance and design.