A point light source S is outside a cylinder on its axis near the end – McqOptions

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1.	A point light source S is outside a cylinder on its axis near the end face (base). Determine the minimum refractive index n of the cylinder material for which none of the rays entering the base will emerge from the lateral surface.
A.	\[1/\sqrt{2}~\]
B.	\[\sqrt{2}\]
C.	\[1/2~~\]
D.	\[~1\]
Answer» C. \[1/2~~\]

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