Answer
$-5.0$
Work Step by Step
Recall that the magnification of the system, $M$, is the product of the magnification of each lens;
$M=m_1m_2$
From equation 34-6, we know that $m=-i/p$; therefore we can obtain:
$M=(-i_1/p_1)(-i_2/p_2)$
$M=(-20cm/20cm)(-(-50cm)/10cm)$
$M=-5.0$
