Question
Download Solution PDFLight wave propagation is possible in optical fibre due to a phenomenon called:
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDF- In an optical fiber, the information is passed through light, which must not escape outside of it.
- This phenomenon of confining the light inside the optical fiber is termed as Total internal reflection.
- For this, the construction and material used to ensure that the total internal reflection of light takes place to prevent the escape of it.
- When light travels from a high refractive index medium to a low-refractive-index medium, it is refracted away from the normal as shown:
- At a certain angle θi, there is no refracted wave and the wave is totally internally reflected (θr = 90°).
- This angle is called a critical angle.
- Inside an optical fiber, we have a high refractive index core (n1) and low refractive index cladding (n2).
- This results in the propagation of waves inside a fiber through total internal reflection phenomenon.
Principle:
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