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You find an unlabeled box of fine needles, and want to determine how thick they are. A standard ruler won\'t do the job, since all you can tell is that each needle is less than a millimeter thick. So to find the thickness, you use the needle to poke a hole in a piece of brown construction paper. Then you arrange your 670 nm laser pointer to shine through the hole, and a circular diffraction pattern, consisting of a central bright circle surrounded by alternating dark and bright rings, appears on the wall 20.7 m away. Now you can use your ruler to measure that the central bright circle is 11.7 cm in diameter. What is the diameter of the needle?

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