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Formula Total Internal Reflection (TIR) Critical angle    Refractive index of the 1st medium    Refractive index of the 2nd medium

Formula
Formula: Total Internal Reflection (TIR)
Light Beam with Angle of Incidence and Refraction for Snell's Law

Critical angle

Unit
The critical angle is the angle of incidence of the light beam (measured relative to the normal) below which the light beam does NOT penetrate the other medium (e.g. water).

Refractive index of the 1st medium

Unit
Brechungsindex des Mediums aus dem der Lichtstrahl kommt. Wenn das erste Medium zum Beispiel Luft ist, dann gilt: \( n_1 ~=~ 1 \).

Refractive index of the 2nd medium

Refractive index of the medium into which the light beam penetrates. If the second medium is for example water, then: \( n_2 ~=~ 1.33 \).