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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.

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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°

I got this question during a job interview.

My question is from Optical Fibre in portion Laser of Engineering Physics II

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Right option is (b) 15.07°

Explanation: sin i = (Numerical aperture)/n

sin i = 15.07°.

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