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← ScienceWhich mechanism impairs laser engraving precision on acrylic?
A)Thermal expansion distortions accrue unevenly✓
B)Photobleaching alters local absorbance
C)Raman scattering overwhelms reflections
D)Plasma formation induces material oxidation
💡 Explanation
Uneven thermal expansion of the acrylic causes positional inaccuracies because differential heating drives localized density changes. This mechanism, termed thermal distortion, prevents precise engraving rather than photobleaching, which darkens the engraving, or plasma formation, which occur at high power.
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