The velocity of light in a medium is half its velocity in air. If ra – McqOptions

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1.	The velocity of light in a medium is half its velocity in air. If ray of light emerges from such a medium into air, the angle of incidence, at which it will be totally internally reflected, is [Roorkee 1999]
A.	\[{{15}^{o}}\]
B.	\[{{30}^{o}}\]
C.	\[{{45}^{o}}\]
D.	\[{{60}^{o}}\]
Answer» C. \[{{45}^{o}}\]

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