Light wave enters from medium 1 to medium 2. its velocity in 2n-Turito

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Physics-

General

Easy

Question

Light wave enters from medium 1 to medium 2. Its velocity in 2^nd medium is double from 1^st. For total internal reflection the angle of incidence must be greater than

$30^{\circ}$
$60^{\circ}$
$45^{\circ}$
$90^{\circ}$

The correct answer is: $30 to the power of ring operator$

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