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If light, travelling from denser to rarer medium, is incident at an angle equal to the critical angle, it grazes the surface. However, a light traveling along the surface will not enter the medium from that same point. Is it a violation of the principle of reversibility?

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If light, travelling from denser to rarer medium, is incident at an angle equal to the critical angle, it grazes the surface. However, a light traveling along the surface will not enter the medium from that same point. Is it a violation of the principle of reversibility?	6