Bissoy.com
Doctors Medicines MCQs Q&A

What is the relation between the refractive index of core n1 and cladding n2?

What is the relation between the refractive index of core n1 and cladding n2? Correct Answer n2 is less than n1

  • Optical fibers are cylindrical solid glass material acting as waveguides made of two concentric layers of very pure glass.
  • The core (the interior layer) with refractive index n1 serves as the medium for light propagation, while the cladding (the exterior layer) has a lower refractive index n2 where n1 > n2 assuring that light rays are reflected the core.
  • Since the cladding does not absorb any light from the core, the light wave can travel great distances.

[ alt="OFC" src="//storage.googleapis.com/tb-img/production/19/03/OFC.PNG" style="width: 626px; height: 293px;">

Explanation:

  • The working principle of optical fibers is Total Internal Reflection.
  • Optical fiber mostly used for communication purposes with negligible loss of energy.
  • The “Total Internal Reflection” of light is the boundary between transparent media of two different refractive indices.
  • At present, Optical fiber cables are used for communication like sending images, voice messages, etc.
  • The designing of this cable is done with Plastic or glass so that data can be transmitted effectively and quickly than other modes of communications

Related Questions

Choose the correct relation for a combination of two prisms to be achromatic. (Where for the first prism: μv = refractive index of the medium in violet light, μr = refractive index of the medium in red light A = angle of the prism; For the second prism: μ′v = refractive index of the medium in violet light, μ′r = refractive index of the medium in red light, A’ = angle of prism.)
Losses caused by factors such as core-cladding diameter, numerical aperture, relative refractive index differences, different refractive index profiles, fiber faults are known as ____________
The core refractive index should be lesser than the cladding refractive index for a coaxial cable. State True/False
A 4 km optical link consists of multimode step index fiber with core refractive index of 1.3 and a relative refractive index difference of 1%. Find the delay difference between the slowest and fastest modes at the fiber output.
A multimode step-index fiber has a core refractive index of 1.5 and relative refractive index difference of 1%. The length of the optical link is 6 km. Estimate the RMS pulse broadening due to intermodal dispersion on the link.
An optical fiber has core-index of 1.480 and a cladding index of 1.478. What should be the core size for single mode operation at 1310nm?
A crown glass prism with refractive index 6° is to be achromatized for red and blue color light with flint glass prism. What will be the angle of flint glass prism? (µr = 1.513, µr‘ = 1.645, µ2 = 1.523 and µ2‘ = 1.665, Where µr and µ2 are refractive indices of red and blue light respectively whereas, µr‘ and µ2‘ are refractive indices of red and blue light respectively for flint glass.)
Which of the following is true if the refractive index of the inner core and outer cladding of an optical fibre is n1 and n2 respectively?
Cladding in glass fibre have high refractive index than the core.
A step-index fibre has a numerical aperture of 0.26, a core refractive index of 1.5 and a core diameter of 100micrometer. Calculate the acceptance angle.