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zebra:eva -(hmy si-1 w1)/(umy si-1 w1) ! the back focal length of wavelength 1 u*i[A\Y eva -(hmy si-1 w2)/(umy si-1 w2) ! the back focal length of wavelength 2 (2021-10-18 21:45) }m0hq+p^
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