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Diffraction Grating. 1. 2. 3. ½ . ¼ . 4. Double Slit. ½ . 3. 2. . 0. Path length difference. Diffraction Grating. 1 cancels 3 2 cancels 4. 3. 2. . 0.
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Diffraction Grating 1 2 3 ½ ¼ 4 Double Slit ½ 3 2 0 Path length difference Diffraction Grating 1 cancels 3 2 cancels 4 3 2 0