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Moire Patterns
Moire fringes arise from interference patterns that are generated when two similar grids overlap each other. The result is a series of fringe patterns that change shape as the grids are translated with respect to one another. One of the more common occurrences of moire patterns is found in computer monitors and television sets where we see an ordered wavy pattern superimposed over the screen in a series of ripples. Moire patterns also are a common problem in scanned images due to optical interference between the printed dot pattern and the reflection of the image.
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