what is the critical angle of incidence
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When the angle of incidence in water reaches a certain critical value, the refracted ray lies along the boundary, having an angle of refraction of 90-degrees. This angle of incidence is known as the critical angle; it is the largest angle of incidence for which refraction can still occur.
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The Ange of incidence beyond which Ray of light passing from denser medium to a surface of less denser medium not refracted but totally internally reflected is known as critical Ange of incidence.
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