In Young's double slit experiment, $5^{t h}$ dark fringe is formed opposite to one of the slits. If $D$ is the distance between slits and the screen, and $d$ is the separation between the slits, then the wavelength of light used is ?

\frac{d^{2}}{6 D}

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\frac{d^{2}}{5 D}

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\frac{d^{2}}{15 D}

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\frac{d^{2}}{9 D}

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Solution

The correct option is D $\frac{d^{2}}{9 D}$
Correct option is D

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