The refractive index is 2.33 and the critical angle is 350. Find the numerical aperture.
(a) 2
(b) 1.9
(c) 2.33
(d) 12
I had been asked this question in an interview for job.
This intriguing question comes from Refractive Index and Numerical Aperture in section EM Wave Propagation of Electromagnetic Theory
Select the correct answer from above options
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