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Chapter 20: Q18P (page 526)

Explain how an optical fibre works. Why does the fibre still work when it is bent?

Short Answer

Expert verified

When the fibre is bent, theθjangle exceeds the critical angle, preventing light from leaving the core.

Step by step solution

01

Definition of optical fibre.

An optical fibre is a transparent, flexible fibre manufactured by pulling glass or plastic to a diameter slightly larger than a human hair.

02

The working of optical fibre.

The light from an optical fibre strikes the core's wall at an angle of incidence called θj. A portion of the light may be reflected inside the core, while the remainder may be transmitted at the refraction angle θr.The Snell's law is:

n1·sinθj=n2·sinθr

All light is reflected if the incidence angle is larger than the critical angle for complete reflection.

03

The reason for working of optical fibre when it is bent.

When the fibre is bent, theθiwill still exceed the critical angle, preventing light from leaving the core.

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