Answer
$10.7cm$
Work Step by Step
We can find the focal length as
$f=(\frac{1}{d_{\circ}}+\frac{1}{d_i})^{-1}$
We plug in the known values to obtain:
$f=(\frac{1}{10.1}+\frac{1}{-176})^{-1}$
$f=10.7cm$
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