(Answered) Light from a sodium lamp passes through a diffraction

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Light from a sodium lamp passes through a diffraction grating having 1250 slits per mm. The interference pattern is viewed on a screen 2 m behind the grating. Two bright yellow spots are visible 217.5 cm and 218.11 cm from the central maximum. What is the difference (in nm) between the wavelengths of the light corresponding to these spots?

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