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A diffraction grating has a slit distance of 3 μm. At what angle will purple light...

A diffraction grating has a slit distance of 3 μm. At what angle will purple light (405 nm) be seen in the 1st order? At what angle will turquoise light (484 nm) be seen in the second order? If the light is projected on a screen 0.3 m away, how wide will the whole second order (400nm – 680nm) appear on the screen?

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