Question:-
The cladding material of a step index fiber has a relative permittivity of 2.4375. Assuming both core and cladding materials to be non-magnetic, in order to have a numerical aperture of 0.25 the refractive index of the core should be
Option (A)
5
Option (B)
2.5
Option(C)
Ö3.5
Option(D)
Ö2.5
Correct Option:
(D)
question-answer-faq-2052