What is the main feature required by the optical fiber for the propagation of light in an optical fiber?
Correct answer: B. Light should be totally confined within the fiber
- A. Optical glass should be cleaned
- B. Light should be totally confined within the fiber
- C. They are cheaper than copper wire
- D. LED light must be used
Explanation
Optical fibers typically include a core surrounded by a transparent cladding material with a lower index of refraction. Light is kept in the core by the phenomenon of total internal reflection which causes the fiber to act as a waveguide. To ensure proper transmission light should be confined within the fiber.
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Light is studied through reflection, refraction, dispersion, interference, diffraction and polarization, linking ray behavior with its wave nature. Questions may involve mirrors, lenses, optical instruments, refractive index and image formation, while geometrical optics deals with rays and wave optics explains effects such as interference and diffraction.
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