Light is confined within the core of a simple optical fiber by:

Light is confined within the core of a simple optical fiber by: 

(1) Refraction. (2) Total internal reflection at the outer edge of the cladding. (3) Total internal reflection at the core cladding boundary. (4) Reflection from the fiber's plastic coating.
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1 Answer

Answer :

Light is confined within the core of a simple optical fiber by: Total internal reflection at the core cladding boundary. 

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