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Plane waves of blue light, ℷ = 434 nm, falls on a single slit, then pass...

Plane waves of blue light, ℷ = 434 nm, falls on a single slit, then pass through a lens with a focal length of 85.0 cm between the screen and the slit. If the central band of the diffraction pattern on the screen has a width of 2.450 mm, find (a) the width “a” of the single slit. (b) the linear distance from the center of the screen of the first minimum of the diffraction pattern.

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