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10. Wave optics — Physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 SciencePhysics10. Wave optics1 Mark
MCQ
A screen is placed at a certain distance from a narrow slit which is illuminated by a parallel beam of monochromatic light. What will you observe if you scan the screen  with the help of microscope
  • A
    Equally spaced and equally bright fringes are observed
  • B
    The whole screen is uniformly illuminated
  • ✓
    A bright central fringe bordered on both sides with fringes of rapidly decreasing intensity  will be observed
  • D
    Only one bright frings is observed at the centre of the screen
✓

Answer

Correct option: C.
A bright central fringe bordered on both sides with fringes of rapidly decreasing intensity  will be observed
c
On the screen, diffraction pattern is observed due to single slit. This is characterized by a bright central fringe bordered on both sides by fringes of rapidly decreasing intensity.

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