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Standard XII
Physics
Total Internal Reflection
Question

Light rays move in straight lines. But through an optical fibre, they can move in any type of zigzag path because

A
Light rays are absorbed at the entry end and relieved at the exit end of the fibre.
B
Scattering of light occurs inside the fibre.
C
The holes through the fibre are extremely fine.
D
Successive total internal reflections occur as a ray moves through the fibre.
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Solution
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Correct option is D. Successive total internal reflections occur as a ray moves through the fibre.
When light enters through one end of the fibre it undergoes successive total internal reflections from sidewall and travels down the length of the fibre along a zigzag path. A small fraction of light may escape through side walls but a major fraction emerges out from the other end of the fibre.

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