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How much a laser beam can be expanded inside interferometer using grazing incidence interferometry?

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How much a laser beam can be expanded inside interferometer using grazing incidence interferometry?

(a) 200 mm

(b) 200 nm

(c) 400 mm

(d) 400 nm

The question was posed to me during an interview.

Enquiry is from Grazing Incident Technique to Evaluate Surface Flatness in portion Machine Vision Systems of Engineering Metrology

1 Answer

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Best answer
Right option is (a) 200 mm

Best explanation: In this instrument, inside the interferometer a laser beam can be expanded into 200 mm column of light. The interference pattern obtained by this process represents the shape of the part of the surface.

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