Quiz  /  Optical Instruments Gate & PSU MCQ Questions With Answers

  • 1. 
    Mie scattering occurs when size of inhomogeneities is :

  • Comparable to wavelength
  • Smaller than wavelength
  • Larger than wavelength
  • Equal to wavelength

  • 2. 
    For efficient propagation of light through a fiber angle of incident of light rays at the fiber input should be :

  • Less than critical angle
  • Less than acceptance angle
  • Less than Brewster's angle

  • 3. 
    What is the energy of blue photon (lambda = 400 nm)?

  • 79.5 × 10 ^ -19 J
  • 4.97 × 10 ^-19 J
  • 1.8 × 10 ^ -19 J
  • 8 × 10 ^ -19 J

  • 4. 
    Numerical aperture of a fiber is given by :

  • (n1^2 - n2^2)^1/2
  • (n2^2 - n1^2)1/2
  • (n1^2 - n2^2)
  • (n1^2 - n2^2)^3/2

  • 5. 
    Total internal reflection is associated with

  • Brewster's Angle
  • Critical angle
  • incident angle

  • 6. 
    Rayleigh scattering occurs when when size of inhomogeneities is :

  • Comparable to wavelength
  • Smaller than wavelength
  • Larger than wavelength
  • Equal to wavelength

  • 7. 
    Refractive index of cladding varies in graded index fibers?

  • True
  • False

  • 8. 
    During Total Internal Reflection light moves from

  • Denser to rarer medium
  • Rarer to denser medium

  • 9. 
    What is the first window for optical communication?

  • 860nm
  • 850nm
  • 890nm
  • 870nm

  • 10. 
    Which is the fundamental mode of propagation in fibers?

  • LP01
  • LP11
  • LP21
  • LP22
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