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A Helium discharge lamp gives off two wavelengths 611 nm and 485 nm. The diffraction grating has 462 lines/mm that is observered on a screen that is 1.50 m away. What is the distance between the first order fringes of the two different wavelengths?


4.09×10-10 m
2.36 m
1.46 m
0.0965 m

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