a light ray reflect between a and b of r. I 1.750 and 1.430 then the limmiting value of angle of incidence above which the light ray undergo the total internal reflection
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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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