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A tiny circular obstacle is placed in th...

A tiny circular obstacle is placed in the path of light from a distant source of light and the pattern formed is observed on a screen
(A) A dark spot is seen at the centre of the bright patch formed by obstacle
(B) A bright spot is seen at the centre of shadow of obstacle
(C) A dark spot of size same as that of obstacle is observed
(D) The screen is of uniform bright illumination

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