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Perhaps to confuse a predator, some tropical gyrinid beetles(whirligig beetles) are colored by optical interference that is dueto scales whose alignment forms a diffraction grating (whichscatters light instead of transmitting it). when the incident lightrays are perpendicular to the grating, the angle between thefirst-order maxima (on opposite sides of the zeroth-order maximum)is about 30° in light with a wavelength of 589 nm. what is thegrating spacing of the beetle?
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Perhaps to confuse a predator, some tropical gyrinid beetles(whirligig beetles) are colored by optic...
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