= Optical bench
An <optical bench> is a rail or aligned platform carrying an object, <optical lens> elements and a screen or detector at readable positions. It turns <image formation> into measurements of position and <transverse magnification>. Read distances between the optical planes rather than arbitrary holder boundaries; keep heights and <optical axis> alignment controlled. https://www.pasco.com/resources/lab-experiments/484[PASCO, Object and Image Distances Thin Lens: bench apparatus and measurements]{ref}.
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