A light unstretchable string passing over a smooth light pulley connects two blocks of masses \( m_{1} \) and \( m_{2} \). If the acceleration of the system is \( \dfrac{g}{8} \), then the ratio of the masses \( \dfrac{m_{2}}{m_{1}} \) is:
\( 5:3 \)
\( 4:3 \)
\( 8:1 \)
\( 9:7 \)
