1.

Up to which accuracy length can be measured by laser interferometer?

A. 1 part in 10<sup>8</sup>
B. 2 part in 10<sup>8</sup>
C. 1 part in 10<sup>6</sup>
D. 2 part in 10<sup>6</sup>
Answer» D. 2 part in 10<sup>6</sup>


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