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Question

Which of the following phenomena takes place inside an optical fiber?


A

Total internal reflection

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B

Scattering

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C

Diffraction

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D

Refraction

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Solution

The correct option is A

Total internal reflection


Explanation of correct option

Option A,

Total internal reflection

  1. It is the phenomenon of complete reflection of light within a medium from the surrounding surfaces back into the medium.
  2. We know, total internal reflection happens when the angle made by the incidence ray is greater than the critical angle.
  3. In the case of an optical fiber, the rays reflect back to the medium after touching the cladding and again when it comes in contact with the other side of the cladding, it again gets reflected. Therefore, total internal reflection takes place inside an optic fiber.

Option A is correct

Explanation of incorrect options

Option B,

Scattering

  1. The change in the direction of motion of a particle due to collision with another particle is called scattering.
  2. This is not used in optical fiber cable.

Option B is incorrect

Option C,

Diffraction

  1. It is the bending of light around the corners of an obstacle.
  2. here, the spreading of waves takes place.
  3. This is also not used in optical fiber cable.

Option C is incorrect

Option D,

Refraction

  1. It is the bending of light when it passes from one media to another.
  2. Here, since the light is not traveling from one media to another.
  3. Refraction does not take place in optical fiber. cables.

Option D is incorrect.

Therefore, option A is correct.


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