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Chapter 18: Problem 18

The principle of optical fibre is (A) Diffraction (B) Polarization (C) Interference (D) Total internal reflection

Short Answer

Expert verified
The principle of optical fibre is (D) Total Internal Reflection. Optical fibres rely on this phenomenon to guide light along the fibre by keeping it confined within the core. The other options, Diffraction, Polarization, and Interference, are not the primary underlying principles of optical fibre transmission.

Step by step solution

01

Understand Optical Fibre

Optical fibre is a flexible, transparent fibre made of glass or plastic which functions as a waveguide, transmitting light between the two ends of the fibre. The main advantage of optical fibre is that it can transmit light signals over long distances without any significant loss of signal strength or quality.
02

Define Diffraction

Diffraction is the bending of light waves as they pass through an aperture or around an object. In the context of optical fibre, diffraction does not play a significant role in the transmission of light through the fibre.
03

Define Polarization

Polarization refers to the orientation of the electric field component of a light wave. Light waves can be polarized in a linear, circular, or elliptical manner. While polarization plays a role in some communication systems, it is not the primary underlying principle of optical fibre.
04

Define Interference

Interference occurs when two or more light waves overlap, resulting in a new wave pattern with different intensity and phase distribution. Although interference can be observed in some optical fibre systems, it is not the main principle behind optical fibre transmission.
05

Define Total Internal Reflection

Total internal reflection (TIR) is a phenomenon that occurs when a wave traveling in a medium (like light in an optical fibre) strikes a medium boundary (like the cladding surrounding the fibre core) at an angle larger than a certain angle called the critical angle. If this condition is met, the wave reflects entirely back into the first medium without leaving the boundary. Optical fibres rely on this principle to guide light along the fibre by keeping it confined within the core.
06

Identify the correct answer

As we have analyzed the definitions and relevance of the four choices in the context of optical fibre, we can conclude that the principle of optical fibre is (D) Total Internal Reflection.

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Most popular questions from this chapter

In a Young's double slit experiment, the fringe width is found to be \(0.4 \mathrm{~mm}\). If the whole apparatus is immersed in water of refractive index \((4 / 3)\), without disturbing the geometrical arrangement, the new fringe width will be (A) \(0.30 \mathrm{~mm}\) (B) \(0.40 \mathrm{~mm}\) (C) \(0.53 \mathrm{~mm}\) (D) 450 microns

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