d_{2} = d_{1} + \frac{λ}{4 (n_{0} - n_{e})} = 7, 35 \cdot 10^{- 4} - \frac{5, 46 \cdot 10^{- 7}}{4 \times (1, 5553 - 1, 5462)} = 7, 2 \cdot 10^{- 4} m

${d_2=d_1+ \frac{\lambda}{4(n_0-n_e )} =7,35 \cdot 10^{-4}- \frac{5,46 \cdot 10^{-7}}{4 \times (1,5553-1,5462)}=7,2 \cdot 10^{-4}\, \mathrm{m}}$

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