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Wave Optics — Physics STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 SciencePhysicsWave Optics1 Mark
Question
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?
✓

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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