Flatness:
A surface is said to be flat within a given range of measurement.
Flatness testing:
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If the test surface is large, then it is tested for flatness using a sprit level o collimator.
Procedure to determine flatness:
A surface can be considered to be a collection of a large number of lines.
Flatness testing by interferometry:
Monochromatic light source and a set of optical flats are used.
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