Question

State the condition under which total internal reflection occurs.

Answer 1

The critical angle occurs when the incident angle causes the angle of refraction to be 90 degrees from the normal. During total internal reflection, no refraction whatsoever occurs; all of the light is reflected within the original medium.

Answer 2

Answer:

HeyaMate..!

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There are two conditions for total internal reflection of light to take place :

(1) Light has to travel from denser medium to rarer medium but not vice-versa.

(2) Critical angle of the medium θ c =

${sin}^{ - 1} ( \frac{nrarer}{ndencer} )$

where n is the refractive index.

Angle of incidence θ must be greater than the critical angle of medium θc .