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In the method of microscopic inspection what is the angle of beam light with the work?

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In the method of microscopic inspection what is the angle of beam light with the work?

(a) 20^0

(b) 30^0

(c) 60^0

(d) 90^0

I had been asked this question during an online exam.

Origin of the question is Methods of Measuring Surface Finish in division Measurement of Surface Finish of Engineering Metrology

1 Answer

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Correct option is (c) 60^0

For explanation: In one method of microscopic inspection, a straight edge is placed on the surface to be inspected and a beam of light is projected at about 60 degree to the work. The shadows cast into the surface scratches are magnified and studied.

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