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What is T.I.R? - total internal reflection
When a light ray hits the boundary between 2 materials of different densities
Beyond a certain angle, the angle become critical so all the waves reflect back so it is known as T.I.R.
How to calculate the T.I.R:
Sin c = nr / ni
Sin critical angle = angle of reflection/angle of incidence
How to calculate refractive index:
η= sin i/ sin r
η= sine of the angle of incidence/ sine of the angle of refraction
Refractive index of:
air: 1.0002 water: 1.333
crown glass:1.517 dense flint glass: 1.655 diamond: 2.417
