If a diffraction grating is heated (without damaging it) and therefore expands, what happens to the angular location of the first-order maximum?

Name: If a diffraction grating is heated (without damaging it) and therefore expands, what happens to the angular location of the first-order maximum?
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The Answer of If a diffraction grating is heated (without damaging it) and therefore expands, what happens to the angular location of the first-order maximum?

If a Diffraction Grating Is Heated (Without Damaging It) and Therefore