A) \[{{n}_{1}}={{n}_{2}}\]
B) \[{{n}_{1}}\le {{n}_{2}}\]
C) \[{{n}_{1}}<{{n}_{2}}\]
D) \[{{n}_{1}}>{{n}_{2}}\]
E) \[{{n}_{1}}\ge {{n}_{2}}\]
Correct Answer: D
Solution :
Optical fibre is made of a thin glass core (diameter 10 to\[100\text{ }\mu m\]) surrounded by a glass coating called cladding is protected by a jacket of plastic. The refractive index of the glass used for making core\[({{n}_{1}}\approx 1.7)\]is a little more than the refractive index of the glass\[({{n}_{2}}=1.5)\]used for making the cladding ie,\[{{n}_{1}}>{{n}_{2}}\].
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