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9. Ray optics abd optical instruments — Physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 SciencePhysics9. Ray optics abd optical instruments1 Mark
MCQ
The phenomenon utilised in an optical fibre is
  • A
    Refraction
  • B
    Interference
  • C
    Polarization
  • ✓
    Total internal reflection
✓

Answer

Correct option: D.
Total internal reflection
d
(d)

Total internal reflection is a powerful process since it can be used to confine light. One of the most common applications of total internal reflection is in fibre optics. An optical fibre is a thin, transparent fibre, usually made of glass or plastic, for transmitting light.

If light is incident on a cable end with an angle of incidence greater than the critical angle then the light will remain trapped inside the glass strand. In this way, light travels very quickly down the length of the cable over a very long distance (tens of kilometers).

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