Josef von Fraunhofer made the fi rst diffraction grating in 1821 and used it to measure the wavelengths of specifi c colors as well as the dark lines in the solar spectrum. His first diffraction grating consisted of 262 parallel wires. Assume that the wires were 0.20 mm apart and that Fraunhofer could resolve two spectral lines that were defl ected at angles 0.50 min of arc apart. Using this grating, what is the minimum separation (in wavelength) that can be resolved of two fi rstorder spectral lines near a wavelength of 400 nm?

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Josef von Fraunhofer made the fi rst diffraction grating in 1821 and used it to measure the wavelengths of specifi c colors as well as the dark lines in the solar spectrum. His first diffraction grating consisted of 262 parallel wires. Assume that the wires were 0.20 mm apart and that Fraunhofer could resolve two spectral lines that were defl ected at angles 0.50 min of arc apart. Using this grating, what is the minimum separation (in wavelength) that can be resolved of two fi rstorder spectral lines near a wavelength of 400 nm?

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