【Daily Question】Theoretical Foundation 2020.06.07
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Multiple-choice question: If white light is incident on a diffraction grating, within the visible light range, in the same order of spectra, which color isthest from the central principal maximum? A. Blue light B. Red light C. Yellow light D. Violet light. Answer: B. Hint: Those who can explain the solution process will receive an additional reward; the answer can be found in the response!
From the grating diffraction formula dsinθ=±kλ (k=0, 1, 2…), it follows that red light, with the longest wavelength in the visible spectrum, corresponds to the largest diffraction angle and is thus the farthest from the central principal maximum.