In certain cases, interference patterns, also known as Newton's rings, can be observed both in reflected and transmitted light at certain support pillars within the array spacing. The Optical Performance Calculator helps to choose an optimal array spacing by calculating the Newton's rings width, which should be less than 30 microns, and is determined as the smallest size visible by an adult at a distance of 100 mm. The detail of the calculation can be found in Background Theory here.
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