The early reflectors
Compare the optics of the first three telescope designs.
Published:
March 23, 2009
| The first reflecting telescopes — telescopes that use a mirror instead of lens to gather the incoming light — appeared in the 1660s and 1670s. Three reflecting telescope designs — Gregorian, Newtonian, and Cassegrain — landed on the scene within 10 years of each other. |
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