[Solved] What is the position of straightness interferometer in straightness measurement optics?

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Q.	What is the position of straightness interferometer in straightness measurement optics?
A.	before laser head
B.	after straightness reflector
C.	between laser head and straightness reflector
D.	no need of interferometer
Answer» C. between laser head and straightness reflector
Explanation: straightness interferometer is placed between laser head and reflector.

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