Light wave enters from medium 1 to medium 2. Its velocity in 2nd med – McqOptions

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1.	Light wave enters from medium 1 to medium 2. Its velocity in 2nd medium is double from 1st. For total internal reflection the angle of incidence must be greater than [CPMT 2002]
A.	\[{{30}^{o}}\]
B.	\[{{60}^{o}}\]
C.	\[{{45}^{o}}\]
D.	\[{{90}^{o}}\]
Answer» B. \[{{60}^{o}}\]

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