Critical Angle Calculator

Enter the refractive index in medium 1 and the refractive index in the medium 2 into the calculator. The calculator will evaluate and display the critical angle.

Critical Angle Formula

The following equation is used to calculate the critical angle through two mediums.

αc = sin-1(n2 / n1)

  • Where Ac is the critical angle
  • n1 is the refractive index in medium 1
  • n2 is the refractive index in medium 2

What is a critical angle?

A critical angle is the angle is an angle described by snells law that is a measure of the refraction of light through different mediums.

critical angle calculator

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