Question: 4 In viewing the far - field diffraction pattern of a single slit illuminated by a discrete - spectrum source with the help of absorption

4 In viewing the far-field diffraction pattern of a single slit illuminated by a discrete-spectrum source with the help of absorption filters, one finds that the fifth minimum of one wavelength component coincides exactly with the fourth minimint of the pattern due to a wavelength ol 620 mm . What is the other wavelength?
4 In viewing the far - field diffraction pattern

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