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MCQBeginnerTelescopes, Observing & Instrumentation
USAAAO — 2024 First Round
Question 26
An astronomer wants to design a telescope so that the full moon fills the entire FOV of the telescope. She uses an eyepiece with a FOV of 60°. If the focal length of the eyepiece is 25 mm, what will the focal length of the chosen telescope be? Note that the angular diameter of the moon is 0.5°. Never look at the moon through a telescope without proper precautions!
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Source
USAAAO 2024 First Round, Question 26. Question text, choices, and answer were transcribed from the official USAAAO exam and solutions PDFs.