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MCQIntermediateObservational Astronomy & Telescopes
USAAAO — 2023 First Round
Question 24
Erez is designing a Newtonian telescope! The equation of the primary mirror is y = x^2/(36 m) − 1 m, and the telescope tube intersects the mirror at y = 0. What is the f-number (focal ratio) of the telescope?
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Source
USAAAO 2023 First Round. Question text, choices, and answer were transcribed from the official USAAAO exam and solutions PDFs.