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Which outcome occurs when reflective diffraction gratings experience thermal expansion?

A)Spectral resolution decreases noticeably
B)Grating efficiency remains optimal
C)Reflected wavelengths shift blue-ward
D)Grating sustains physical fracture easily

💡 Explanation

Thermal expansion alters groove spacing, causing constructive interference at altered exit angles, therefore spectral resolution decreases because each wavelength will diffract under a different and wider location, rather than resolution improving or shifting wavelengths, because blue shifts and ruptures happen otherwise.

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