If the angle between optical flat and surface to be tested is very sma – McqOptions

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1.	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?
A.	‚âà√≠¬¨‚Ñ¢
B.	‚âà√≠¬¨‚Ñ¢/2
C.	‚âà√≠¬¨‚Ñ¢/3
D.	3‚âà√≠¬¨‚Ñ¢/2
Answer» C. ‚âà√≠¬¨‚Ñ¢/3

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