Physics Quiz: Trivia Questions On Wave Optics!

15 Questions | Total Attempts: 511

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Physics Quiz: Trivia Questions On Wave Optics!

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Questions and Answers
  • 1. 
    For sustained interference, we need two sources which emit radiations:
    • A. 

      Of the same intensity

    • B. 

      Of the same amplitude

    • C. 

      Having a constant phase difference

    • D. 

      None of these

  • 2. 
    Two beams of light having intensities I and 4I interfere to produce a fringe pattern on a screen. The phase difference between the beams is π/2, at a point A and π at a point B. The difference between the resultant intensities at A and B is:
    • A. 

      2I

    • B. 

      4I

    • C. 

      5I

    • D. 

      7I

  • 3. 
    n identical waves each of intensity Io interfere each other. The ratio of maximum intensities if interference is coherent and incoherent is:
    • A. 

      N

    • B. 

      N2

    • C. 

      N3

    • D. 

      1/n2

  • 4. 
    The initial shape of the wavefront of the beam is:
    • A. 

      Concave

    • B. 

      Convex near the axis and concave near the periphery

    • C. 

      Planar

    • D. 

      Convex

  • 5. 
    Two coherent sources of intensity ratio β interfere. Then the value of
    • A. 
    • B. 
    • C. 
    • D. 
  • 6. 
    The fringe width β of a diffraction pattern and the slit width d are related as:
    • A. 

      βαd

    • B. 
    • C. 
    • D. 
  • 7. 
    Two periodic waves of intensities I1 and I2 pass through a region at the same time in the same direction. The sum of the maximum and minimum intensities is:
    • A. 
    • B. 
    • C. 
    • D. 
  • 8. 
    A beam is used in young’s double slit experiment. The slit width is d. When the velocity of electron is increased, then
    • A. 

      No interference in observed

    • B. 

      Fringe width increases

    • C. 

      Fringe width decreases

    • D. 

      Fringe width remains same

  • 9. 
    A Polaroid produces a strong beam of light which is:
    • A. 

      Circularly polarised

    • B. 

      Elliptically polarised

    • C. 

      Plane polarised

    • D. 

      Unpolarised

  • 10. 
    The angle between pass axis of polarizer and analyzer is 45o. The percentage of polarised light passing through analyzer is:
    • A. 

      100%

    • B. 

      50%

    • C. 

      25%

    • D. 

      75%

  • 11. 
    A phase difference of 5π corresponds to a path difference (in terms λ) of:
    • A. 

    • B. 

      10λ

    • C. 

      5λ/2

    • D. 

  • 12. 
    Two coherent monochromatic light beams of intensities I and 4I are superposed. The maximum and minimum possible intensities in the resulting beam are:
    • A. 

      5I and I

    • B. 

      9I and I

    • C. 

      5I and 3I

    • D. 

      9I and 3I

  • 13. 
    What happens if one of the slits, say S1, in Young’s double slit experiment is covered with a glass plate which absorbs half the intensity of light from it?
    • A. 

      The bright fringes become less bright and dark fringes have a finite light intensity

    • B. 

      The bright fringes become brighter and dark fringes become darker

    • C. 

      The fringe width decreases

    • D. 

      No fringes will be observed

  • 14. 
    In a double slit experiment, the distance between the slits is d. The screen is at a distance D from the slits. If a bright fringe is formed opposite of one of the slits, find its order:
    • A. 
    • B. 
    • C. 
    • D. 
  • 15. 
    Two coherent monochromatic light sources are located at two vertices of an equilateral triangle. If the intensity due to each of the sources independently is 1Wm-2 at the third vertex, the resultant intensity due to both the sources at that point (i.e., at the third vertex) is:
    • A. 

      Zero

    • B. 
    • C. 

      2

    • D. 

      4

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