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MCQBeginnerObservational Astronomy & Telescopes
USAAAO — 2021 First Round
Question 13
The reflector telescope built by Sir Issac Newton was a f/5 telescope and had a primary mirror of diameter 30mm. He used an eyepiece with a focal length of 5mm. What is the focal length and magnification obtained by this telescope?
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Source
USAAAO 2021 First Round. Question text, choices, and answer were transcribed from the official USAAAO exam and solutions PDFs.