Young's double slit: fringe width β = λD/d. If d doubled, β becomes:

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β ∝ 1/d. If d' = 2d, β' = β/2. Fringe width decreases with increased slit separation. Memory aid: 'β ∝ 1/d; wider slit separation ⇒ narrower fringes'. Wave optics proportionality frequently tested in competitive exams.

Young's double slit: fringe width β = λD/d. If d doubled, β becomes: MCQ with Answer and Explanation

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