The critical angle is the angle of incidence in the more dense medium at which the angle of refraction is 90 degrees. The critical angle (Θcrit) can be calculated using the Snell's law equation. The equation simplifies to:
Θcrit = sin-1 (n2/n1)
where n2 is the index of refraction of the least dense medium (into which light is heading) and n1 is the index of refraction of the most dense medium (through which light is traveling).
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