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Which risk increases when multi-layer optical coatings experience thermal expansion?

A)Thin-film interference shifts optimal wavelengths
B)Total internal reflection exceeds threshold
C)Increased convective heat transfer occurs inside
D)Substrate material reaches glass transition.

💡 Explanation

Thermal stresses cause thin-film constructive and destructive interference patterns, shifting peak wavelengths, because expansion changes layer thicknesses therefore desired reflectance is no longer achieved rather than changes in internal reflection which are unrelated to uniform thermal gradients.

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