The diameter of the full Moon in the focal plane of an average amateur's telescope (focal length 1.5 meters) is 13.8 mm How big would the Moon be in the focal plane of a very large astronomical telescope (focal length 250 meters)? | Numerade

A small telescope has a concave mirror with a 2.00  m radius of curvature for its objective. Its eyepiece is a 4.00  cm focal length lens. (a) What is the telescope's angular magnification? (b) What angle is subtended by a 25,000  km diameter sunspot? (c) What is the angle of its telescopic image? | Numerade

A telescope of objective lens diameter 2 m uses light of wavelength 5000 Å for viewing stars. The minimum angular separation between two stars whose image - | Shaalaa.com

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Telescope aperture

Telescope focal length