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When a grating is used with light that has a wavelength of 621 nm, a third-order maximum is formed at an angle of 18.0. How many lines per centimeter...

When a grating is used with light that has a wavelength of 621 nm, a third-order maximum is formed at an angle of 18.0°. How many lines per centimeter does this grating have?
answer in lines/cm

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