3 Plane waves from a magnesium lamp 2 518 36 nm arrive perpendicularly on an...
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3 Plane waves from a magnesium lamp 2 518 36 nm arrive perpendicularly on an opaque screen containing a long 0 250 mm wide slit A large nearby positive lens forms a sharp image of the Fraunhofer diffraction pattern on a screen The center of the fourth dark fringe is found be 1 20 mm from the central axis Determine the focal length of the lens
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