Monday Homework Problem $15\mathrm{.}6$ The projector in White Hall G$09$ is about $7$m $=700$cm from the screen at the front of the classroom. From the size of the projector enclosure, the object in the projector cannot be more than $5$cm from the projector lens. What is the approximate focal length of the lens in the projector? Select One of the Following: $($a$)4\mathrm{.}96$cm $($b$)5\mathrm{.}04$cm $($c$)30\mathrm{.}3$cm $($d$)350$cm $($e$)700$cm