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← ScienceWhich sensor outcome indicates elevated stress in copolymer film?
A)Increased birefringence due to chain alignment✓
B)Decreased refractive index homogeneity
C)Elevated X-ray diffraction line intensity
D)Reduced UV-Vis transmission at 500nm
💡 Explanation
Increased stress aligns the polymer chains, so stress-induced birefringence changes polarization because of the photoelastic effect. Therefore, higher birefringence indicates higher stress, rather than refractive index changes or simple transmission variations under constant conditions.
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