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STRUT INFLUENCE The number and position of struts holding up the secondary mirror determine the struts' diffraction spike pattern. In the first row, there is a set of struts organized in a single line. When light hits a strut, the light bends into a single, perpendicular pattern of amplified and canceled light (represented by a yellow dashed line). In the second row, it shows a second set of struts added to the first, creating a second, perpendicular diffraction spike (represented by a red dashed line). In the third row, there are three struts with two of them at an angle. In this case, there would be three diffraction spikes, with each spike perpendicular to a strut (represented by yellow, red, and blue dashed lines).

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