Question

For a step index fibre with a core of refractive index of 1.54 and cladding refractive index 1.5 calculate the following when fibre is kept in water

a)Fractional refractive index

Answer 1

Fractional Refractive index, $\Delta=\dfrac{\mu_1-\mu_2}{\mu_1}$

$\Delta=\dfrac{1.54-1.50}{1.54}=0.025$