Snell's Law Calculator

Calculate refraction angles using Snell's Law. Find critical angles and total internal reflection.

Solve For

n₁ (incident medium)

n₂ (refracted medium)

θ₁ - Incident Angle (°)

θ₂ - Refracted Angle (°)

(solving)

Refraction Results

n₁

1.5

n₂

30°

θ₁

19.47°

θ₂

Relative Index (n₂/n₁): 1.5

Brewster's Angle: 56.31°

Common Refractive Indices

Vacuum:1

Air:1.0003

Water:1.333

Glass:1.5

Diamond:2.42

Ice:1.31

Ethanol:1.36

Glycerin:1.47

Quartz:1.46

Light bends toward the normal when entering a denser medium.

n₁ sin(θ₁) = n₂ sin(θ₂)

Critical angle: sin(θc) = n₂/n₁

Brewster's angle: tan(θB) = n₂/n₁

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