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NEET 2019 · Total Internal Reflection

Total Internal Reflection question from NEET 2019

Q42NEET 2019Easy

Total Internal Reflection

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

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Answer: (b)

Critical angle is defined as the angle of incidence for which the angle of refraction is $90^\circ$ .
The refracted ray grazes along the boundary.
So the answer is (b) $90^\circ$ .

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