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Which outcome results when thin-film interference occurs within precision gauge blocks?

A)Visual contour reveals surface variations
B)Material phase transition to martensite
C)Accelerated diffusion of grain boundaries
D)Increased compressive residual stress appears

💡 Explanation

When gauge blocks are wrung together, small gaps create thin films. Light reflects from the surfaces, and the **interference** of these reflections changes with thickness. Variations in thickness alter wavelengths constructively/destructively observed, because brighter/darker regions visual contour differences, showing surface variations rather than those of martensite.

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