← Back to Training
MCQIntermediateObservational Astronomy & Telescopes
USAAAO — 2014 National Astronomy Olympiad
Question 9
Approximately how much higher is the limiting magnitude of a telescope than that of the human eye? Assume that the telescope has an aperture of 200mm and the diameter of the human iris is 5mm. (A magnitude difference of 5 corresponds to a 100-fold difference in luminosity).
Sign in to save your progress.
Source
Source: USAAAO National Astronomy Olympiad 2013–2014, Section A: Multiple Choice, Question 9.