What is the width of the central maximum on a screen 20 m


A 0.50-mm-wide slit is illuminated by light of wavelength 500 nm.

If the index of refraction of the coating is 1.38, what thickness should the coating be so as to be most effective at 480 nm? The thinnest possible coating is best.

What is the width of the central maximum on a screen 2.0 m behind the slit?

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Physics: What is the width of the central maximum on a screen 20 m
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