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JEE Main 2025 (4 Apr, Shift 1) · YDSE: Fringe Width & Fringe Positions

YDSE: Fringe Width & Fringe Positions question from JEE Main 2025 (4 Apr, Shift 1)

Q12JEE Main 2025 · 4 APR · SHIFT 1Easy

YDSE: Fringe Width & Fringe Positions

In a Young's double slit experiment, the slits are separated by 0.2 mm. If the slits separation is increased to 0.4 mm, the percentage change of the fringe width is:

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Answer: (b)

$\beta \propto \frac{1}{d}$ ; $d$ goes from 0.2 mm to 0.4 mm, so $\beta' = \frac{\beta}{2}$ .
Percentage change $= \frac{\beta - \beta/2}{\beta}\times100 = 50\%$ (decrease)
So the answer is (b) $50\%$ .

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