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A glass material A with which an optical fibre is made has a refractive index of 1.55. this material is clad with another material whose refractive index is 1.51.
written 5.3 years ago by gravatar for vermavarsha432 vermavarsha432 • 1000 modified 4.0 years ago by gravatar for sanketshingote sanketshingote • 100

The light in the fibre is launched from air. Calculate the numerical aperture of the fibre.
advanced engineering physics
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written 5.1 years ago by gravatar for teamques10 teamques10 ★ 64k •   modified 5.1 years ago

Solution:

$\mu_1 = 1.55$

$\mu_2 = 1.51$

$\mu_0 = 1$

$N.A = ?$

$\begin{aligned} N.A &= \sqrt{\mu_1 - \mu_2} \\ &= \sqrt{(1.55)^2-(1.51)^2} \\ &= 0.349 \end{aligned}$
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