In Young's double slit experiment. $1 s t$ dark fringe occurs directly opposite to a slit. Wavelength of light used is :

d^{2} / D

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d / D

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D^{2} / d

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2 d^{2} / D

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Solution

The correct option is A $d^{2} / D$
Formula needed : $y = \frac{D}{d} (2 n - 2) λ$

putting $y = \frac{d}{2}$

$λ = \frac{d^{2}}{D}$

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In Young's double slit experiment. 1st dark fringe occurs directly opposite to a slit. Wavelength of light used is :

The correct option is A d2/DFormula needed :y=Dd(2n−2)λputting y=d2λ=d2D

In Young's double slit experiment. $1 s t$ dark fringe occurs directly opposite to a slit. Wavelength of light used is :

The correct option is A $d^{2} / D$
Formula needed : $y = \frac{D}{d} (2 n - 2) λ$

putting $y = \frac{d}{2}$

$λ = \frac{d^{2}}{D}$