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An optical fibre without cladding has a Refractive Index =1.5 and a diameter of 50μm. What...

An optical fibre without cladding has a Refractive Index =1.5 and a diameter of 50μm. What is the approximate pulse broadening per km? The cable is now dipped in water. Will the NA of the fibre change? What is its angle of acceptance when in air and when dipped in water?

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