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← ScienceWhich consequence most directly results when anisotropic polymer films used in LCD screens experience excessive mechanical stress?
A)Localized variation in refractive index✓
B)Increased thermal expansion coefficient
C)Selective absorption of blue light
D)Reduced electron mobility in pixels
💡 Explanation
Localized changes in stress induce temporary birefringence because stress modifies the polymer chains altering the *stress-optic effect*. This causes variations in the observed refractive index; therefore refractive index changes, rather than directly inducing thermal expansion or electronic changes.
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