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Which consequence results when strained glass exhibits birefringence?

A)Stress visualisation via photoelasticity occurs
B)Increased thermal expansion happens
C)Complete structural shattering results rapidly
D)Reduced refractive index is observed

💡 Explanation

Stress causes spatial variation in the refractive index, with birefringence emerging; this causes polarized light to split into two rays experiencing different refractive indices. Stress visualisation via photoelasticity occurs, because applied stress causes varying interference patterns, therefore stress can become visible, rather than changes in expansion.

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