If any surface has a scratch on it and surface is tested by surface co – McqOptions

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1.	If any surface has a scratch on it and surface is tested by surface contour test then, what is the depth of scratch? (D= distance between fringes, d= distance due to scratch)
A.	(d/D)*(‚âà√≠¬¨‚Ñ¢)
B.	(d/D)*(‚âà√≠¬¨‚Ñ¢/2)
C.	(d/D)*(‚âà√≠¬¨‚Ñ¢/4)
D.	(d/D)*(3‚âà√≠¬¨‚Ñ¢/2)
Answer» C. (d/D)*(‚âà√≠¬¨‚Ñ¢/4)

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