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My solution :- (https://i.imgur.com/28TFOHo.jpg?1)

the critical angle at the core-in cladding interfaces 80 degree .Determine the

numerical aperture and the acceptance angle at the fiber in air, assuming it

has a core diameter suitable for consideration by ray analysis .The velocity of

light in vacuum is 3x 108 m/sec

profile, (ii) refractive index difference at the core of 0.5%, and (iii) core diameter of

9.0 μm

(a) Calculate the refractive index of the fiber core and cladding at 1.310 and 1.55 μm

wavelengths

(b) What is the estimated loss of this fiber at the wavelengths mentioned?

(c) What are the V parameters of the fiber at these wavelengths?