Why a thick film shows no colour in reflected white light?

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asked Nov 28, 2024 183k views

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Oimitro · Answer 1 · 2024-12-03T19:41:13+0000

When white light enters a thin film, wavelengths interfere and create colorful fringes. However, a thick film will show no color in reflected white light because the optical path difference is greater than the coherence length.

Why a thick film shows no colour in reflected white light?

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