The early reflectors
Compare the optics of the first three telescope designs.
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.
You are not currently logged in. To view this page you must be a subscriber to Astronomy magazine.
|
Already a subscriber?
|
Not a subscriber?
|
|
|
Subscribe today and get 12 issues of Astronomy magazine
plus these great online subscriber-only benefits:
|
