What is the Refraction Index Calculator?

The Refraction Index Calculator helps users determine the unknown quantity in Snell’s Law—either the refractive index of a medium or the angle of incidence/refraction. By providing any three of the four variables (n₁, θ₁, n₂, θ₂), the calculator accurately computes the fourth, allowing students, physicists, and optics enthusiasts to analyze light refraction problems quickly and reliably.

How to Use:

1. Enter Known Values: Provide values for any three of the four fields: Refractive Index of Medium 1 (n₁), Angle of Incidence (θ₁), Refractive Index of Medium 2 (n₂), and Angle of Refraction (θ₂). Leave the unknown field blank.
2. Click “Calculate”: The calculator applies Snell’s Law, n₁·sin(θ₁) = n₂·sin(θ₂), to determine the missing value.
3. View Results: The tool displays all input values, the calculated missing parameter, and the formula used for reference.