Question: Plane waves from a magnesium lamp ( = 518.36 nm) arrive perpendicularly on an opaque screen containing a long 0.250-mm-wide slit. A large nearby positive

Plane waves from a magnesium lamp (λ = 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 to be 1.20 mm from the central axis. Determine the focal length of the lens.

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