A laser has a wavelength of 581 nm. A grating and a lens are used to split the beam into three parallel beams spaced 1.85 cm

Question

A laser has a wavelength of 581 nm. A grating and a lens are used to split the beam into three parallel beams spaced 1.85 cm apart. If the slit spacing is 1.00 μm, what focal length lens should be used?

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