[填空题]
Light of wavelength 590 nm passes through tw 3-ww 7yep7xtvo narrn yo7.+yg tglga9ck-lc8 4 z4bow slits 0.60 mm apart. The screen is 1.70 m away. A second source of unk9c-ykl bt4 ga4 8zl7+.cggo nynown wavelength produces its second-order fringe 1.33 mm closer to the central maximum than the 590-nm light. What is the wavelength of the unknown light? $\lambda_2$ nm
