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Define critical angle for a given medium...

Define critical angle for a given medium

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Critical angle is the angle of incidence in the denser medium corresponding to which the angle of refraction in the rarer medium is `90^@`.
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In total internal reflection when the angle of incidence is equal to the critical angle for the pair of medium in contact, what will be angle of refraction? In total internal reflection when the angle of incidence is equal to the critical angle for the pair of medium in contact, what will be angle of refraction? In total internal reflection when the angle of incidence is equal to the critical angle for the pair of medium in contact, what will be angle of refraction?

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ICSE-QUESTION PAPER-2019-SECTION-II
  1. Define critical angle for a given medium

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