Question
Define numerical aperture and angle of acceptance. An optical fiber has a numerical aperture of 0.20 and cladding refractive index of 1.59. Calculate the refractive index of the core material and the acceptance angle of the fibre in water whose refractive index is 1.33.
Answer :
Word Count : 249
Numerical aperture (NA) of a step-index optical fibre quantifies its light-gathering ability. It is defined by NA = n0 sin θa = √(n1² − n2²), where n0 is the refractive index of the external medium, θa is the maximum acceptance half-angle, n1 is the core index, and n2 is ________ _______ _________ ________ ________ __________ _____ ______.
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Numerical aperture (NA) of a step-index optical fibre quantifies its light-gathering ability. It is defined by NA = n0 sin θa = √(n1² − n2²), where n0 is the refractive index of the external medium, θa is the maximum acceptance half-angle, n1 is the core index, and n2 is ________ _______ _________ ________ ________ __________ _____ ______.
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