The critical angle θc in an optical fiber is given by ______. Where – McqOptions

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1.	The critical angle θc in an optical fiber is given by ______. Where n1 is refractive index of medium 1 and n2 is the refractive index of medium 2.
A.	sin-1 (n2/n1)
B.	sin-1 (n1/n2)
C.	sin-1 (n2*n1)
D.	sin-1 n2
Answer» B. sin-1 (n1/n2)

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