Answer:
When the film is thick\[(t\simeq 20\lambda )\], the path difference \[2\mu t\cos r\]will be so large that the conditions of both maxima and minima for different wavelengths of white light will be essentially satisfied at the same value of thickness t. Different colours will overlap each other at all places of the film ; producing general illumination of the film. No separate colours or fringes will be seen.
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