Q.

A step-index fibre has a numerical aperture of 0.26, a core refractive index of 1.5 and a core diameter of 100micrometer. Calculate the acceptance angle.

A. 1.47°
B. 15.07°
C. 2.18°
D. 24.15°
Answer» B. 15.07°
Explanation: sin i = (numerical aperture)/n sin i = 15.07°.
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