Band width of an optical fiber is

Consider telecommunication through optical fibers. Which of the following statements is not true ?

In an optical fiber during transmission of light

In the center of I-Band, is an elastic fiber, which bisect it

In the center of I-Band, is an elastic fiber, which bisect it

Which of the following phenomenon is used in optical fiber?

Assertion : Optical fibers are used for telecommunication. Reason : Optical fibres are based on the phenomenon of total internal reflection.

Derive the equation for acceptanc angle and numerical aperture, of optical fiber. Acceptance angle in optical fibre: