תרומה סיור הד galilei telescope lenses הר תצטרף סד
optics - How does a Galilean telescope form an enlarged image even though it has a diverging lens? - Physics Stack Exchange
Galileo and the telescope – Explaining Science
Galileo's telescopes Serious errors and inconsistencies in the specifications of the optics and dimensions of has been found in the literature. Griffith Observatory and Adler planetarium replicas
History of Science Society -- Committee on Education
What is Galileo's Telescope? - Universe Today
Galilean Telescope – Part 1 - YouTube
Refracting telescope - Wikipedia
Galilean telescope hi-res stock photography and images - Alamy