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MHT CET 2023 (9 May, Shift 2) · YDSE: Fringe Width & Fringe Positions

YDSE: Fringe Width & Fringe Positions question from MHT CET 2023 (9 May, Shift 2)

Q34MHT CET 2023 · 9 MAY · SHIFT 2Easy

YDSE: Fringe Width & Fringe Positions

In Young's double slit experiment, the fringe width is $2\text{ mm}$ . The separation between the $13$ th bright fringe and the $4$ th dark fringe from the centre of the screen on same side will be

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Answer: (c)

$n$ th bright: $y = n\beta$ ; $n$ th dark: $y = (n - \frac{1}{2})\beta$
13th bright $= 13\beta = 26$ mm, 4th dark $= 3.5\beta = 7$ mm
Separation $= 26 - 7 = 19$ mm, so the answer is (c).

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