In a Young's double$-$slit experiment, the seventh dark fringe is located $0\mathrm{.}027$ m to the side of the central bright fringe on a flat screen, which is $1\mathrm{.}2$ m away from the slits. The separation between the slits is $1\mathrm{.}5{10}^{-4}m.$ What is the wavelength of the light being used?

Number

$1$

$4\mathrm{.}82$E$-7$ Units $$