Which type of pathways is used for laser interferometer present in thr – McqOptions

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1.	Which type of pathways is used for laser interferometer present in three dimensional measuring machines?$
A.	Helium unshielded pathways
B.	Neon unshielded pathways
C.	Helium shielded pathways
D.	Neon shielded pathways
Answer» D. Neon shielded pathways

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