FLATNESS MEASUREMENT

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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