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The total internal reflection can occur when light is traveling from glass to its interface with air.
Total internal reflection occurs when light moves from denser to rarer and the angle of incidence is greater than the critical angle.
Total Internal Reflection occurs when light travels from water to air, but it does not occur when light travels from air to water. Total Internal Reflection would occur for light travelling from water to air, but not for light travelling from water (n=1.333) to crown glass (n=1.52). TIR occurs when the angle of refraction approaches 90 degrees before the angle of incidence approaches 90 degrees. Light can only bend away from the normal if the angle of refraction is greater than the angle of incidence. Because light only bends away from the normal when passing from a denser medium to a denser medium, this would be a necessary condition for total internal reflection.
Thus, TIR occurs when light is travelling from glass towards air.
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