In a multiple$-$slit interference experiment, NN narrow slits are equally spaced $150$m apart and illuminated with light of wavelength $560$nm$.$ The interference pattern is projected on a screen placed at a distance from the barrier and slits that is large compared to the slit separation.

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$$ Part $($a$)$

What is the angular width, in radians, of the central principal maximum if N$=20$N$=20?$

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Degrees Radians

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$$ Part $($b$)$

What is the angular width, in radians, of the central principal maximum if N$=50$N$=50?$