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In total internal reflection when the angle of inclination is equal to the critical angle for the pair of media in contact, what will be the angle of reflection?

In total internal reflection when the angle of inclination is equal to the critical angle for the pair of media in contact, what will be the angle of reflection? Correct Answer 90

Concept:

  • According to the definition, a critical angle provides an angle of refraction of 90 degrees.
  • That means the angle of refraction will be the right angle if we get a particular incidence angle value which is expressed as (ic) and this particular incidence angle is called the critical angle.
  • The optical phenomena are effective when light is passing between two different media.
  • For example, air-water, glass-water, etc.

 

Calculation:

given that,

  • At ic = I in this case as explained above the refracted ray will graze with the surface as shown below

 

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Hence the angle of refraction is 90°

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