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Reflection & Refraction

Incident Angle45°
89°
n₁ (Medium 1)1.00
1.002.50
n₂ (Medium 2)1.50
1.002.50
Presets:

Physics Readouts

θ incident45.0°
θ reflected45.0°
θ refracted28.1°
Critical angleN/A
Reflectance (Fresnel)4.0%

Legend

Incident ray
Reflected ray
Refracted ray
TIR / reflected under TIR
Critical angle guide

Challenge Mode

1 of 5

Set n₂ so the refracted angle is exactly 30° (keep incident angle at 45°).

Snell's law: n₁ sin(θᵢ) = n₂ sin(θₜ)
Critical: θc = arcsin(n₂/n₁) when n₁ > n₂