\( T= \frac{t}{n}\Rightarrow t=Tn\\ t_1=t_2\\ T_1n_1=T_2n_2\\ 2\pi \sqrt{\frac{l_1}{g} } n_1=2\pi \sqrt{\frac{l_2}{g} }n_2\\ l_1n_1^2=l_2n_2^2\\ \bigtriangleup l=l_2-l_1\Rightarrow l_1=l_2-\bigtriangleup l\\ (l_2-\bigtriangleup l)n_1^2=l_2n_2^2\\ n_1^2l_2-n_1^2\bigtriangleup l=l_2n_2^2\\ l_2(n_1^2-n_2^2)=n_1^2\bigtriangleup l\Rightarrow l_2= \frac{n_1^2\bigtriangleup l}{n_1^2-n_2^2}\\ l_2= \frac{10^2*0,16}{10^2-6^2}=0,25_M=25_C_M\\ l_1=25-16=9_C_M \)\\
Ответ: \( l_1=9_C_M;\ l_2=25_C_M \)