In YDSE, fringe width β =
Aλ × D × d
Bλ × d / D
CD / d
Dλ D / d (D = screen distance, d = slit separation)
Answer & Solution
Correct answer: D. λ D / d (D = screen distance, d = slit separation)
β = λD/d. Constant spacing between consecutive bright (or dark) fringes. Increases with longer wavelength or larger D, decreases with larger slit separation d.
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