2. To determine the wavelength λx of an unknown line in the spectrum of the analyzed sample, two lines were selected in the spectrum of iron with wavelengths λ1 = 308.375 and λ2 = 309.158 nm. Readings on the scale of the measuring microscope showed that the distance between λx and λ1 is equal to a1 = 0.25 mm, and between λ2 and λx is equal to a2 = 1.88 mm. Determine the wavelength of the unknown line.

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