Assertion :In YDSE number of bright fringe or dark fringe can not be unlimited Reason: In YDSE path difference between the superposing waves can not be more than the distance between the slits

Assertion is correct and Reason are incorrect

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect;Reason is not correct explanation for Assertion

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Both Assertion and Reason are incorrect

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Solution

The correct option is D Both Assertion and Reason are incorrect
Path difference at a point of superposition on the screen at a distance 'y' from the central maxima in YDSE is given by $\frac{y d}{D}$ .
Thus $y$ can be any large to form any order of bright or dark fringe.
Apparently from the expression of path difference, it can be more than $d$ for large values of y.

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