Refracting/reflecting telescopes, magnification, resolving power and modern observatories.
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Q1 · Telescopes and Instruments · MEDIUM
A Newtonian reflector telescope has a primary mirror of diameter 20 cm and focal length 100 cm. What is its f-number (focal ratio)?
Q2 · Telescopes and Instruments · MEDIUM
A refracting telescope has an objective lens of focal length 120 cm and an eyepiece of focal length 2.5 cm. What is the magnifying power of this telescope in normal adjustment?
Q3 · Telescopes and Instruments · EASY
A telescope has a primary mirror diameter of 2.4 meters and operates at a wavelength of 600 nm. What is the approximate angular resolution (in arcseconds) of this telescope according to the Rayleigh criterion?