An optical fibre has a core material of refractive index of 1.55 and cladding material of refractive index of 1.50. The numerical aperture of the fibre is

An optical fibre has a core material of refractive index of 1.55 and c

1.	An optical fibre has a core material of refractive index of 1.55 and cladding material of refractive index of 1.50. The numerical aperture of the fibre is
A.	0.05
B.	0.39
C.	3.05
D.	0.9
Answer» C. 3.05

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An optical fibre has a core material of refractive index of 1.55 and cladding material of refractive index of 1.50. The numerical aperture of the fibre is

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