Physics
A light ray travelling from denser to rarer medium at an angle of incidence more than critical angle of concerned media pair suffers.

Diffraction
Refraction
Total internal reflection
Reflection

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Physics
Holography is a technique of

Recording a permanent three dimensional photograph of a given single colour or a multicolour
Recording a permanent, sharp two diimensional black and white or multicolour photograph
Recording a permanent three dimensional black and white photograph
Recording a permanent three dimensional multicolour photograph

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