Which of the following is not true for optical flats used in surface c – McqOptions

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1.	Which of the following is not true for optical flats used in surface contour test?
A.	Colourless
B.	Always wrung on the work piece
C.	Work piece and optical flat should be free from dust, dust and fingerprints
D.	Optical flat should always be lifted from work piece
Answer» C. Work piece and optical flat should be free from dust, dust and fingerprints

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