Critical Angle for Total Internal Reflection calculator

This CalcTown calculator calculates the critical angle for Total Internal Reflection when light passes from a medium of higher refractive index to that with a lower refractive index. Critical angle is the minimum angle of incidence for which total internal reflection takes place.

Refractive index of incident medium (n_i)

Refractive index of refracting medium (n_r)

Result

Critical angle of reflection

where

θc=Critical Angle of incidence

n_i=Refractive index of medium 1

n_r=Refractive index of medium 2