Question $2(25$ pts$,$ Ch$.24)$

An object is placed $do=6\mathrm{.}1cm$ from a diverging lens, with a radius of curvature $R=4\mathrm{.}88cm$ and an index of refraction of $n=1\mathrm{.}850,$ as shown in the figure.

$($a$)$ Determine the magnitude $|$di$|$ of the image distance for the object.

$($b$)$ What is the magnification m of the object?