(a) the focal length of lens used for observation

(b) the number of half-period zones that superpose at the point

(c) the square of the sum of the number pf half period zones

(d) the thickness of the obstacle

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(a) the focal length of lens used for observation

(b) the number of half-period zones that superpose at the point

(c) the square of the sum of the number pf half period zones

(d) the thickness of the obstacle

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