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TIR stands for Total Internal Reflection , in this the incident ray got reflected totally inside the denser medium i.e. water (say) .

TIR always occurs from denser to rarer medium .

in TIR refraction angle(r) is 90° & the incident angle denoted by (ic) also called critical angle in this case .

If the ray falls greater than the critical angle it suffers TIR .

Some examples of TIR is :-

1. Optical fibres

2. Shining of diamond , due to its very less critical angle.
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