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MHT CET 2025 (26 Apr, Shift 2) · YDSE: Fringe Width & Fringe Positions

YDSE: Fringe Width & Fringe Positions question from MHT CET 2025 (26 Apr, Shift 2)

Q15MHT CET 2025 · 26 APR · SHIFT 2Medium

YDSE: Fringe Width & Fringe Positions

Graph shows the variation of fringe width ( X) versus distance of the screen from the plane of the slits (D) in Young's double slit experiment. (keeping other parameters same, $d =$ distance between the slits). The wavelength of light used can be calculated as

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Answer: (d)

$X = \frac{\lambda D}{d}$ , a straight line through the origin in an $X$ – $D$ graph.
Slope $= \frac{\lambda}{d} \Rightarrow \lambda = \text{slope} \times d$
So the answer is (d) slope $\times d$ .

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