Why a thick film shows no colour in reflected white light?
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Thick plates doesnt show interference pattern as the optical path difference is greater than coherency length. Hence no fringe formation takes place and colours don't segregate and hece all light is seen as white light.
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Answer:
Thick film shows no color in reflected white light because optical path difference is greater than coherence length.
Explanation:
When white light enters on thin film, wavelengths interfere and produce colorful fringes.
In case of thick film, optical path difference is greater than the coherence length. As a result of this, there is no formation of fringe. There is no segregation of colors and hence all light appears as white light.
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