A step index fiber is made with a core of refractive index 1.36, a diameter of 49pm and a fractional refractive index change of 0.025. it is operated at a wavelength of 1.3. Then the numerical aperture of the cable is
The refractive index is inversely proportional to the wavelength.
Let the refractive index of cladding be n' .
Hence, we know
= Refractive index of cladding.
We know,
Numerical aperture,
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