In optical fibre, refractive index of inner part is 1.68 and refractive index of iouter part is 1.44. the numerical aperture is
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Numerical aperture=sintheta=√(mu1^2-mu2^2)
=√1.68^2 -1.44^2
=0.866
=√1.68^2 -1.44^2
=0.866
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