At what distance instrument is placed when straightness is determined – McqOptions

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1.	At what distance instrument is placed when straightness is determined with the help of autocollimator?
A.	0.5 to 0.75 mm
B.	0.5 to 0.75 cm
C.	0.5 to 0.75 m
D.	0.5 to 0.75 ¬¨¬®¬¨¬µm
Answer» D. 0.5 to 0.75 ¬¨¬®¬¨¬µm

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