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Fresnel diffraction is produced due to light rays falling on a small obstacle. The intensity of light at a point on a screen beyond an obstacle depends on

(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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1 Answer

b) the number of half-period zones that superpose at the point
answered Nov 7, 2013 by pady_1
 

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