Dispersion, Fermat’s Principle & its Application MCQ

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• Dispersive power of the material of the prism is 0.0221. If the deviation produced by it for yellow color is 38°, then the angular dispersion between red and violet color is?
  ক

  0.84°

  খ

  0.65°

  গ

  0.48°

  ঘ

  1.26°
• Find the ratio of mean deviation produced, if the ratio of dispersive power of the material of two prism are 2:3 and ratio of angular dispersions produced by them is 1:2.
  ক

  1:3

  খ

  4:3

  গ

  3:1

  ঘ

  3:4
• 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.)
  ক

  1.5°

  খ

  2.4°

  গ

  3°

  ঘ

  4.5°
• A thin prism P1 having angle 4° and refractive index 1.54 is combined with another thin prism P2 of refractive index 1.72 for producing dispersion without deviation. The angle of P2 is?
  ক

  4°

  খ

  5.33°

  গ

  3°

  ঘ

  2.6°
• White light is passed through a prism having angle 5°. If the refractive indices for red color and blur color are 1.641 and 1.659 respectively. Find the angle between them.
  ক

  3.295°

  খ

  4°

  গ

  0.090°

  ঘ

  0.65°
• If light travels in a medium of Refractive Index 1.4 through a distance 250 m in a given time interval, then how much distance will it cover in refractive index 1.75?
  ক

  250 m

  খ

  500 m

  গ

  200 m

  ঘ

  312.5 m
• If a monochromatic light goes through 2 cm of glass or 2.25 cm of water, the optical path is the same. If refractive index of glass is 1.50, then what is the refractive index of water?
  ক

  1.33

  খ

  1.23

  গ

  1.50

  ঘ

  1.13
• What does first law of reflection state?
  ক

  The incident ray, reflected ray and normal ray, at the point of incidence, are in same plane

  খ

  The incident ray, reflected ray and normal ray, at the point of incidence, are perpendicular to each other

  গ

  The incident ray, reflected ray and normal ray at the point of incidence are in different plane

  ঘ

  mSin(i)=nSir(r)
• Name the person, who formed “The Principle of least time“?
  ক

  Pierre de Fermat

  খ

  C.V Raman

  গ

  John Kepler

  ঘ

  Albert Abraham Michelson
• What will be the time taken by a ray of light travelling from one point to another, by any number of refractions & reflections follows that particular path?
  ক

  Highest

  খ

  Least

  গ

  Maximum

  ঘ

  Moderate
• The product of the Geometric Length of the path light follows through the system, and the refractive index of the medium is known as __________
  ক

  Fermat Path

  খ

  Optical Path

  গ

  Ray Path

  ঘ

  Optical Path Difference