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← ScienceWhich unintended outcome occurs when coating thickness varies anisotropically?
A)Increased chromatic aberration
B)Visible iridescence appears✓
C)Total internal reflection fails
D)Refractive index becomes uniform
💡 Explanation
Visible iridescence appears because of thin-film interference. Incident light reflects from the air/film and film/substrate interfaces, and path-length differences result in constructive or destructive interference. Therefore, iridescence appears, rather than uniform color due to variations in interference.
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