If the Fresnel s distance is a, then what should be the distance of th – McqOptions

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1.	If the Fresnel s distance is a, then what should be the distance of the screen from the slit, d, such that ray optics is no longer valid?
A.	d > a
B.	d < a
C.	d = a
D.	No relation between d and a
Answer» C. d = a

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