$3.$ Multiple Choice $2$ points

Two $0\mathrm{.}010-mm-$wide slits are $0\mathrm{.}035$ mm apart $($center to center$).$ Determine the distance between the two diffraction minima on either side of the central maximum of the envelope.

$10\mathrm{.}4$ cm

$2\mathrm{.}6$ cm

$5\mathrm{.}2$ cm

$3\mathrm{.}8$ cm

$4.$ Multiple Choice $2$ points

Two $0\mathrm{.}010-mm-$wide slits are $0\mathrm{.}035$ mm apart $($center to center$).$ How many interference fringes $($bright lines$)$ are clearly visible in the central diffraction peak?

$5$

$6$

$4$

$7$