Perhaps to confuse a predator, some tropical beetles are colored byoptical interference that is due to scales whose alignment forms adiffraction grating (which scatters light instead of transmitingit). When the incident light rays are perpendicular to the grating,the angle between the first-order maxima (on opposite sides of thezeroth-order maximum) is 43° inlight with a wavelength of 550 nm. What is the grating spacing of the beetle?