Perhaps to confuse a predator some tropical beetles, Ask an Expert

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Perhaps to confuse a predator, some tropical beetles arecolored by optical interference that is due to scales whosealignment forms a diffraction grating (which scatters light insteadof transmiting it). When the incident light rays are perpendicularto the grating, the angle between the first-order maxima (onopposite sides of the zeroth-order maximum) is 33° in light with a wavelength of 550 nm. What is the grating spacing of the beetle?

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