The value of critical angle for TIR for glass and diamond are 42° and 24.2°.
Total internal reflection (TIR) is the phenomenon that involves the reflection of all the incident light off the boundary. TIR only takes place when both of the following two conditions are met:
1)a light ray is in the more dense medium and approaching the less dense medium.
2)the angle of incidence for the light ray is greater than the so-called critical angle.
a) for glass the value of refractive angle 1.5
critical angle =sin⁻(1÷μ)
therefore critical angle for glass will be 42°
b) for diamond the value of refractive angle 2.42
therefore critical angle for glass will be 24.2°
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