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Measurement-by-Light-Wave-Interference

What is pattern of fringes, if an optical flat is resting on any hill?


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If the angle between optical flat and surface to be tested is very small, then what is the difference of separation between optical flat and surface between two similar adjacent fringes?

What is pattern of fringes, if an optical flat is resting on any hill?

Which of the following option is correct for the given statements about interferometry applied to flatness testing?
Statement 1: If the angle between optical flat and surface is too large then there will be largely spaced fringe pattern is observed.
Statement 2: Quartz flats are very sensitive to heat.

What is the pattern of fringes

if an optical flat is resting on any hill?

Measurement by Light-Wave Interference

Engineering-Metrology