n a Young's double slit experiment, the separation between the slits is $1\mathrm{.}20104$ m; and

the screen is located $3\mathrm{.}50$ m from the slits. The distance between the central bright fringe

and the second$-$order bright fringe is $0\mathrm{.}0375$ m$.$ What is the wavelength of the light used

in this experiment?

$2)$ Light of $600\mathrm{.}0$ nm is incident upon a single slit. The resulting diffraction pattern is

observed on a screen that is $0\mathrm{.}50$ m from the slit. The distance between the first and third

minima of the diffraction pattern is $0\mathrm{.}80$ mm$.$ Find the width of the slit.