Question: Martha is viewing a distant mountain with a telescope that has a (120-mathrm{cm})-focal-length objective lens and an eyepiece with a (2.0 mathrm{~cm}) focal length. She

Martha is viewing a distant mountain with a telescope that has a $120-\mathrm{cm}$-focal-length objective lens and an eyepiece with a $2.0 \mathrm{~cm}$ focal length. She sees a bird that's $60 \mathrm{~m}$ distant and wants to observe it. To do so, she has to refocus the telescope. By how far and in which direction (toward or away from the objective) must she move the eyepiece in order to focus on the bird?

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