Light from a sodium lamp $($ $=589$ nmnm$)$ illuminates two narrow slits. The fringe spacing on a screen $100$ cmcm behind the slits is $3\mathrm{.}0$ mmmm$.$

Part A

What is the spacing $($in mmmm$)$ between the two slits?

Express your answer in millimeters.

View Available Hint$($s$)$for Part A

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mmmm