Applications of Total Internal Reflection

Physics

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Total internal reflection in a prism

Some cases of total internal reflection in a prism are discussed below:

1. Right-angled isosceles prism/Total reflecting prism():
Light ray incident normally on a smaller side is deviated by .
Light ray incident normally on hypotenuse is deviated by .
Erecting prism: When object placed at an angle to the smaller side in front of the smaller side, its image is inverted on the other side. 
2. Equilateral prism(): Light incident normally on a side undergoes total internal reflection on other side. Angle of deviation is .
3. Right angled prism():
Light ray incident normally on the smallest side undergoes total internal reflection at hypotenuse.
Light ray incident normally on the longer side (not hypotenuse) does not undergo total internal reflection.
Light ray incident normally on the hypotenuse may or may not undergo total-internal reflection depending upon the point of entering the prism. 

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Total internal reflection in daily life

Some examples of total internal reflection in daily life are the formation of a mirage, shining of empty test-tube in water, shining of crack in a glass-vessel, sparkling of a diamond, transmission of light rays in an optical fibre, etc. 

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Total Internal Reflection and Critical angle

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Optical Fibres

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