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When a tiny circular obstacle is placed ...

When a tiny circular obstacle is placed in the path of light from a distant source,a bright spot is seen at the centre of the shadow of the obstacle. Explain why.

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When a tiny circular obstacle is placed in the path of light form a distant source, waves diffracted from the edge of the circular obstacle interfere constructively at the centre of the shadow, producing a bright spot.
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CHHAYA PUBLICATION-DIFFRACTION AND POLARISATION OF LIGHT-CBSE SCANNER
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