question_answer

If\[{{n}_{1}}\]and\[{{n}_{2}}\]are the refractive indices of the core and the cladding respectively of an optic fibre, then:

A)  \[{{n}_{1}}={{n}_{2}}\]                 

B)         \[{{n}_{1}}<{{n}_{2}}\]

C)  \[{{n}_{2}}<{{n}_{1}}\]                 

D)         \[{{n}_{2}}=2{{n}_{1}}\]

E)  \[{{n}_{2}}=\sqrt{2{{n}_{1}}}\]