Snell's Law (Laws of Refraction) (n1 sin θ1 = n2 sin θ2)
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n1 sin θ1 = n2 sin θ2
What each symbol means
| Symbol | What it stands for |
|---|---|
| n_1 | Refractive index of first medium (incident side) |
| n_2 | Refractive index of second medium (refracted side) |
| \theta_1 | Angle of incidence with the normal (rad or deg, consistent) |
| \theta_2 | Angle of refraction with the normal |
When to use this
Isotropic media; monochromatic light at a sharp plane interface; valid for specular refraction. Angles measured from the normal.