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A fiber optic cable uses total internal reflection. What is the minimum refracti

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Question: A fiber optic cable uses total internal reflection. What is the minimum refractive index required for the core if the cladding has a refractive index of 1.45?

Options:

  1. 1.50
  2. 1.45
  3. 1.60
  4. 1.75

Correct Answer: 1.50

Solution: 

For total internal reflection, the core must have a higher refractive index than the cladding, so it must be greater than 1.45.

A fiber optic cable uses total internal reflection. What is the minimum refracti

Practice Questions

Q1
A fiber optic cable uses total internal reflection. What is the minimum refractive index required for the core if the cladding has a refractive index of 1.45?
  1. 1.50
  2. 1.45
  3. 1.60
  4. 1.75

Questions & Step-by-Step Solutions

A fiber optic cable uses total internal reflection. What is the minimum refractive index required for the core if the cladding has a refractive index of 1.45?
  • Step 1: Understand that a fiber optic cable has two parts: the core and the cladding.
  • Step 2: Know that the core is the part that carries the light, and the cladding surrounds it.
  • Step 3: Remember that for total internal reflection to happen, the core must have a higher refractive index than the cladding.
  • Step 4: Identify the refractive index of the cladding, which is given as 1.45.
  • Step 5: Conclude that the refractive index of the core must be greater than 1.45 for total internal reflection to occur.
  • Total Internal Reflection – The phenomenon where light is completely reflected within a medium when it hits the boundary at an angle greater than the critical angle, requiring the medium to have a higher refractive index than the surrounding medium.
  • Refractive Index – A measure of how much light slows down in a medium compared to its speed in a vacuum; essential for determining the conditions for total internal reflection.
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