STANDARD Physics Young's Double Slit Experiment MCQ Question
Yellow light of wavelength 6000 Å produces fringes of width 0.8 mm in Young's double slit experiment. If the source is replaced by another monochromatic source of wavelength 7500 Å and the separation between the slits is doubled then the fringe width becomes
0.1 mm
0.5 mm
4.3 mm
1 mm
Correct Answer
Detailed Explanation
The fringe width β is given by β = Dλ/d. In the second case, the wavelength is 7500 Å and the separation is doubled, so β₂ = (Dλ₂/2d) = (7500/6000) × (0.8/2) = 0.5 mm.
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