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← ScienceWhich consequence results during thin-film fabrication with mismatched refractive indices?
A)Enhanced mechanical stress
B)Augmented impurity diffusion
C)Fringes indicate film thickness✓
D)Substrate overheating occurs
💡 Explanation
Optical interference creates visible fringes in thin films because variations in thickness reflect light, resulting in constructive and destructive interference. Therefore, fringes indicate film thickness, rather than mechanical stress; impurity diffusion depends on temperature.
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