Question: A diffraction grating has 5 6 0 0 lines / cm . When a beam of monochromatic light goes through it , the second pair

A diffraction grating has 5600 lines/cm . When a beam of monochromatic light goes through it, the second pair of bright spots occurs at 26.0 cm from the central spot on a screen 42.9 cm past the grating.
Part A
What is the wavelength of this light?
Part B
How far from the central spot does the next pair of bright spots occur on the screen?

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