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Q: Optical fiber works on the principal of ?
  • A. diffusion
  • B. total internal reflection
  • C. scattering
  • D. refraction
Correct Answer: Option B - When a light ray travelling from a denser medium towards a rarer medium is incident at the interface at an angle of incidence greater than critical angle, then light rays are reflected back into the denser medium (i.e. same medium). This phenomenon is called total internal reflection. optical fibre works on the principal of total internal reflection.
B. When a light ray travelling from a denser medium towards a rarer medium is incident at the interface at an angle of incidence greater than critical angle, then light rays are reflected back into the denser medium (i.e. same medium). This phenomenon is called total internal reflection. optical fibre works on the principal of total internal reflection.

Explanations:

When a light ray travelling from a denser medium towards a rarer medium is incident at the interface at an angle of incidence greater than critical angle, then light rays are reflected back into the denser medium (i.e. same medium). This phenomenon is called total internal reflection. optical fibre works on the principal of total internal reflection.