In Young’s double-slit experiment, if the separation between coherent sources is halved and the distance of the screen from the sources is doubled, then the fringe width becomes:
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In Young’s double-slit experiment, if the separation between coherent sources is halved and the distance of the screen from the sources is doubled, then the fringe width becomes:

G1 Physics · Accepted Answer

Step 1: Fringe width β = λD/d. Step 2: New D₂ = 2D and d₂ = d/2. Step 3: β₂/β₁ = (2D)/(d/2) × (d/D) = 4. Final answer: (B) four times.