Unless the incident light is moving through the more optically dense material toward the less optically dense medium, the total internal reflection will not occur.
Light moving from water to air will have TIR, but light traveling from air to water will not. If the incidence angle exceeds a specific limitation angle known as the critical angle, the phenomenon will manifest.
The angle of incidence of the light must be greater than the critical angle and it must be traveling from a more dense medium into a less dense media (i.e. glass to air). Light speeds up and changes direction when it passes through water or glass at an angle and enters the atmosphere. Turning away from the usual line, the light.
Some light is reflected off the water when it comes into contact with light that is flying through the air. While the remaining light travels through the water, it bends (or refracts) as it does so.
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