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A 'critical angle', is bascially the smallest angle of incidence for which light can be totally reflected. Incidence is the arrival of a particle or beam of light at a surface. I.e. If a beam of light hits a desktop at the angle of 45 degrees, the angle of incidence will be 45 degrees.

Q: What is meant by the critical angle?
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A 'critical angle', is bascially the smallest angle of incidence for which light can be totally reflected. Incidence is the arrival of a particle or beam of light at a surface. I.e. If a beam of light hits a desktop at the angle of 45 degrees, the angle of incidence will be 45 degrees.

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