The wavelengths of the visible spectrum are approximately 400nm (violet) to 700nm (red). Find the angular width of the first-order visible spectrum produced by a transmission diffraction grating with 484 lines per millimeter when white light falls normally on the grating.Give your an

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The wavelengths of the visible spectrum are approximately 400nm (violet) to 700nm (red). Find the angular width of the first-order visible spectrum produced by a transmission diffraction grating with 484 lines per millimeter when white light falls normally on the grating.Give your answer in degrees. 
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