The angular distance between the center and the first minimum of a single-slit Fraunhofer diffraction pattern is called the half-angular breadth; write an expression for it. Find the corresponding half-linear width (a) when no focusing lens is present and the slit-viewing screen distance is L, and (b) when a lens of focal length f2 is very close to the aperture, Notice that the half-linear width is also the distance between the successive minima.
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