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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 | |