Answered: The numerical aperture (NA) of a fiber… | bartleby

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The numerical aperture (NA) of a fiber characterizes the ability of a fiber
to collect light (a high NA means it collects more light). The NA is defined as the sine of the
maximum external angle of a ray entering the fiber that can be trapped by total internal
1/2
reflection. Show that| NA= n, sin0, = (n – n;)" .

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