Question

1. What is the use of an interference microscope?
a) Measure depth of scratches
b) Measure width of crack
c) Develop a permanent visual record
d) Only illuminate the cracks
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2. What is the tube diameter of rigid borescope?
a) 0.1 to 10 mm
b) 0.5 to 90 mm
c) 0.2 to 100 mm
d) 0.9 to 70 mm
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3 What is the use of fluorescent penetrants?​

Answer 1

Answer:

1 a measure depth of scratches