M - m = - 2, 5 \log \frac{L}{l} = - 2, 5 \log {(\frac{d}{10})}^{2} = - 5 \log \frac{d}{10} .

${M-m = -2,5 \log \frac{L}{l} = -2,5 \log \left( \frac{d}{10} \right)^2 = -5 \log \frac{d}{10}.}$

Error