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You have a red laser with a wavelength of 640 nm (1 nm = 10^-9 m)....

You have a red laser with a wavelength of 640 nm (1 nm = 10^-9 m). This laser is passed through diffraction grating with 1000 lines per mm. If the grating is 20 cm away from a screen, how far from the central bright dot will the next bright dot appear?

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