Enter the refractive index in medium 1 and the refractive index in the medium 2 into the calculator. The calculator will evaluate and display the critical angle.

## Critical Angle Formula

The following equation is used to calculate the critical angle through two mediums.

α_{c} = sin^{-1}(n_{2} / n_{1})

- Where Ac is the critical angle
- n1 is the refractive index in medium 1
- n2 is the refractive index in medium 2

## What is a critical angle?

A critical angle is the angle is an angle described by snells law that is a measure of the refraction of light through different mediums.

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