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Arts, 26.07.2019 15:00 axxpjr12

Martha is viewing a distant mountain with a telescope that has a 120-cm-focal-length objective lens and an eyepiece with a 2.0 cm focal length. she sees a bird that's 48 m distant and wants to observe it. to do so, she has to refocus the telescope.

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Martha is viewing a distant mountain with a telescope that has a 120-cm-focal-length objective lens...
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