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Wave Optics — Physics STD 12 Science — Question

Bihar BoardEnglish MediumSTD 12 SciencePhysicsWave Optics1 Mark
MCQ
A white light is passed through the two narrow slits and produced a pattern of alternating bright and dark lines on the screen as shown above. What will effects on the central bright band , if the distance between screen and slits are increased?

  • A
    Become wider
  • B
    Become narrower
  • C
    Remain unchanged
  • D
    Disappear completely
✓

Answer

  1. Become wider

Explanation:

The setup shown is that of Young's Double Slit Experiment.

The fringe width in the experiment is given as $\beta=\frac{\text{D}\lambda}{\text{d}}​$

where d is the distance between the slits, D is the distance between screen and slits.

Hence the central fringe also widens when distance between screen and slits increases.

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