A single bi$-$concave lens $($ a lens with two concave surfaces$)$ made of fused quartz $($index of refraction $n=1\mathrm{.}46)$ has surfaces with radii of curvature $r_1=-19\mathrm{.}0cm$ and $r_2=19\mathrm{.}0cm.$ What is the focal length of the lens in air?

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If an object is placed at $p=13\mathrm{.}0cm$ from the lens, where is the image? $($Use a positive sign for a real image or a minus sign for a virtual image.$)$

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If the object has a height of $h=1\mathrm{.}10cm,$ how large is the image? $($Use a positive sign for an upright image or a minus sign for an inverted image.$)$

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