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Light Waves — Physics STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 SciencePhysicsLight Waves1 Mark
Question
A Young's double slit experiment is performed with white light:
  1. The central fringe will be white.
  2. There will not be a completely dark fringe.
  3. The fringe next to the central will be red.
  4. The fringe next to the central will be violet.
✓

Answer

  1. The central fringe will be white.
  2. There will not be a completely dark fringe.
  1. The fringe next to the central will be violet.
Explanation:
The superposition of all the colours at the central maxima gives the central band a white colour. As we go from the centre to corner, the fringe colour goes from violet to red. There will not be a completely dark fringe, as complete destructive interference does not take place.

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