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Suppose white light is incident from a extended source on a plane parallel thick film viewed in reflected system, then for any value of r, due to large thickness the values of u can be found to satisfy the condition of constructive interference for every colour in the spectrum of white light. The different coloured fringes will overlap to produce general illumination. Thus, a thick film will produce general illumination and no colour will be seen.

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Q: Why interference not observed in thick film?
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