What happens if the result is undefined?

If light travels from a denser to a less dense medium beyond the critical angle, total internal reflection occurs and there is no refracted ray — the formula has no valid solution in that case.

Snell's Law Calculator

Using Snell's Law, calculate the angle at which light refracts when passing from one material into another with a different refractive index.

Inputs

Results

Angle of Refraction: 19.47 degrees

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Formula

n₁sin(θ₁) = n₂sin(θ₂)

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