1.
If n1 and n2 are the refractive indices of the core and cladding respectively, the maximum acceptance angle at the air-core interface should be

7.
The critical angle θc in an optical fiber is given by . . . . . . . . Where n1 is refractive index of medium 1 and n2 is the refractive index of medium 2.

8.
The configuration used by a line communication system capable of transmitting a data at the rate of 1000 Mbps is

9.
Some of the diffracted light continues down the fiber and some of it escapes through the cladding. The light rays that escape represent a loss in light power which is called

10.
An optical fiber cable laid underground has developed a discontinuity at a distance d from the source end. The fault can be located using the instrument

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