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how will we find core radius using refractive index of core and clad in fibre optics communication?

Public Comments

1. Core and clad refractive index is independant of core radius. Core refractive index is always higher than clad refractive index, so you can have a total internal reflexion when the angle is higher than the critical angle. (Real physics of fiber optics is far more complicated than this, but this model is a lot easier to understand and works pretty well). Bottom line: you cannot know the radius from the refractive indexes. I guess you might be able to find a limit for the core radius if you add some conditions, such as that you want a monomode fiber at some predefined wavelength.