Consider a two slit interference arrangement (shown in figure) such that the distance of the screen from the slits is half the distance between the slits

CBSE Class 12 CBSE Class 12 Physics
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Consider a two slit interference arrangement (shown in figure) such that the distance of the screen from the slits is half the distance between the slits. Obtain the value of D in terms of A such that the first minima on the scfeen fall at a distance D from the centre O.

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hi,

Using the direct formula for the distance of dark fringe from center, I got the answer as lamda/4, which comes out as almost the same answer, but will it be acceptable??