WHICH_OF_THE_FOLLOWING_OPTION_IS_TRUE_FOR_OPTICAL_FLATS_USED_IN_FLATNE – McqOptions

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1.	WHICH_OF_THE_FOLLOWING_OPTION_IS_TRUE_FOR_OPTICAL_FLATS_USED_IN_FLATNESS_TESTING??$
A.	Type A optical flats has only one surface flat
B.	Optical flats are better than quartz flats
C.	White light source is very important in measurement by light wave interference
D.	Working surfaces of optical flats are cylindrical
Answer» B. Optical flats are better than quartz flats

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