Snell's Law
Calculate Snell's Law instantly with the exact formula and a worked example.
Snell's Law
n₁
n₂
Incidence angle°
Refraction angle
19.4712°
More about: Snell's Law
What it calculates
The “Snell's Law” calculator computes Refraction angle in ° from 3 parameters: n₁, n₂, incidence angle (°).
A standard physics formula used in educational and engineering tasks.
Example calculation
With parameters n₁ = 1, n₂ = 1.5, Incidence angle = 30 ° the result is 19.47 ° (sin θ₁ / sin θ₂ = n₂/n₁).
How to use
- Enter n₁, n₂ and incidence angle — each field above is adjustable with a slider.
- Refraction angle (°) is calculated automatically as you type.
- Check the worked example below to see the formula applied to real numbers.
- Copy the result or bookmark this calculator.
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FAQ
How is Snell's Law calculated?
The Snell's Law calculator computes Refraction angle (in °) from n₁, n₂, incidence angle. Enter your values above and the exact formula is applied instantly; a worked example with real numbers is shown below.
Is the Snell's Law calculator free?
Yes. It is completely free, needs no signup, runs entirely in your browser, and sends no data to any server.
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