Home › AP EAPCET (Engineering) › Physics › Ray Optics and Optical Instruments › Optical fibres carry signals over long distances…
Optical fibres carry signals over long distances by which principle?
ADiffraction at the core edge
BPolarisation of the beam
CTotal internal reflection
DDispersion in the cladding
Answer & Solution
Correct answer: C. Total internal reflection
Light inside the fibre core strikes the core boundary beyond the critical angle and is totally reflected again and again, so very little signal is lost.
Related questions
A prismatic corner reflector turns incoming light back along its path using how many totalIn a wiper rain sensor, water drops do what to the infrared beam?Which device uses the critical angle to measure the refractive index of a substance?Which prism pair is commonly used to turn the view upright in binoculars?At the critical angle, the refracted ray travels in which direction?A swimmer looking up from below calm water sees the outside world compressed into a cone. Diamond has a refractive index of about 2.42. Roughly what is its critical angle in air?Which gemstone cut uses total internal reflection off its back facets to look bright?