Snell's Law Calculator

Calculate angles of refraction using Snell's law

Refractive Index 1 (n₁):

Refractive Index 2 (n₂):

Incident Angle θ₁ (degrees):

Refracted Angle θ₂ (degrees):

Common refractive indices: Air ≈ 1.00, Water ≈ 1.33, Glass ≈ 1.5

n₁ sin(θ₁) = n₂ sin(θ₂)

Critical angle: θ_c = arcsin(n₂/n₁) when n₁ > n₂

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MyCalcBuddy Editorial Team

This page is maintained as an educational calculator reference.

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Formula Source: University Physics

by Young & Freedman

ðŸ”„Last reviewed: May 2026

âœ“Formula checks are based on standard references and internal QA review.