Question

define critical angle and total internal reflection​

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-degree.

Explanation:

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Answer 2

Answer:

The critical angle is defined as the angle of incidence that provides an angle of refraction of 90-degrees.

Total internal reflection takes place when the angle of incidence for the light ray is greater than the so-called critical angle.