To find the critical angle is to find those guidelines or criteria that help us to create a constant flow of the electromagnetic spectrum that we know as light.
Critical angle or limit angle is the minimum angle of incidence at which total internal reflection occurs. This angle of incidence is measured with respect to the normal of the media separation.
Light travels, and is perceptible at all times, thus generating different angles and therefore different dynamics in space thanks to the media on which it falls. It is therefore refraction that gives this project its own name.
n1 sin θ1= n2 sin θ2