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.
Numerical aperture (NA) is a dimensionless number that characterizes the ability of an optical fiber to collect and guide light. It is given by the equation:
NA=sinθa=n12−n22NA = \sin \theta_a = \sqrt{n_1^2 - n_2^2}
where n1n_1 is the refractive index of the core, _______ _______ _________ _______ _________ ______ ____ ____.
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