Type-B optical flat is tested for parallelism. What is the formula fo – McqOptions

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1.	Type-B optical flat is tested for parallelism. What is the formula for the difference of the thickness of the flat at 2 points on the adjacent fringe? (µ is the refractive index)
A.	λ/2*(1/µ) microns
B.	λ/4*(µ) microns
C.	λ*µ microns
D.	λ*(µ/2) microns
Answer» B. λ/4*(µ) microns

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