m = \frac{2 d}{λ_{m}} = \frac{2 \times 0, 15}{6, 328 \cdot 10^{- 7}} = 4, 74 \cdot 10^{5}

${m=\frac{2d}{\lambda_m} =\frac{2 \times 0,15}{6,328 \cdot 10^{-7}} = 4,74 \cdot 10^5}$

Error