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Two slits are located a distance $R$ apart from each other, and light shines through the slits to form an interference pattern on a screen.

If the first dark fringe in the interference pattern is observed at an angle $X$ from the center of the pattern, which of the following expressions must be the wavelength of light used?

A

$(R\sin X) / 2$

B

$R\sin X$

C

$R / (2\sin X)$

D

$2R\sin X$

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