When laser light is passed through two narrow slits separated by $158$m$,$ an interference pattern is observed on a screen $1\mathrm{.}62$ m away. The distance between the central spot and the first$-$order constructive interference is found to be $5\mathrm{.}4$ mm$.$

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$$ Part $($a$)$

Find the wavelength of the laser light, in nanometers.

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sin$()$cos$()$tan$()$cotan$()$asin$()$acos$()$atan$()$acotan$()$sinh$()$cosh$()$tanh$()$cotanh$()$

Degrees Radians

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$$ Part $($b$)$

At what angle, in degrees, from the central spot is the second$-$order constructive interference formed?