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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

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The focal length of lens for observation

The number of half-period zones that superpose at the point

The square of the sum of the number of half period zones

The thickness of the obstacle.

answer is B.

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The intensify at any point on the screen due to an obstacle is due to superposition of half period zones at that point

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