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Tell me? In total internal reflection when the angle of incidende is equal to the critical angle for the pair of media in contact what will be angle of refraction ?

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

 

  • Option 1)

    180 

  • Option 2)

  • Option 3)

    equal to angle of incidence 

  • Option 4)

    90 

Answers (1)
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For internal refection 

at i = \theta _c , r = 90 \degree = angle\: \: of\: \: refraction


Option 1)

180 

Option 2)

Option 3)

equal to angle of incidence 

Option 4)

90 

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