True or false: optical fibres

Exercise and reference answers

Questions

1. Statement is true

   Yes

   Statement

   An optical fibre is coated with a material of lower refractive index.

2. Statement is true

   Yes

   Statement

   Light emerges from the far end even if the fibre is bent.

3. Statement is true

   Yes

   Statement

   Optical fibres work by repeated total internal reflection.

4. Statement is true

   No

   Statement

   The coating has a higher refractive index than the core.

5. Statement is true

   No

   Statement

   A bent fibre loses the light out of its side.

Explanation