Question

what is the total internal reflection in brief and define critical angle.​

Answer 1

Answer:

Total

internal reflection takes place when the angle of incidence for the light ray is greater than the so-called critical angle. The critical angle is defined as the angle of incidence that provides an angle of refraction of 90-degrees.

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Answer 2

Answer:

answer:

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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