What do you mean by total internal reflection???
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Total internal reflection is defined as: The phenomenon which occurs when the light rays travel from a more optically denser medium to a less optically denser medium. When the angle of incidence is greater than the critical angle, the incident ray is reflected back to the medium.
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Total internal reflection, in physics, complete reflection of a ray of light within a medium such as water or glass from the surrounding surfaces back into the medium. The phenomenon occurs if the angle of incidence is greater than a certain limiting angle, called the critical angle.
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