Left pointing hand navigation decoration Return to “Telescopes from the Ground Up” Left pointing hand navigation decoration
Telescopes from the Ground Up
Get to the root of it Background Leaf decoration
Newton’s reflecting telescope (1668)
Diagram showing the light path in a Newtonian reflector telescope.

Newton used a metal primary mirror to capture light and a secondary mirror to direct the light out the side of the telescope.

Newton avoided the problem of chromatic aberration by using a mirror instead of a lens, but he could not clear up the blurry images caused by the spherical shape of the mirror. This problem, called spherical aberration, occurs in both spherical mirrors and lenses.


( ! ) Notice: Undefined index: HTTP_REFERER in /local/data1/hosts/as/htdocs/resources/explorations/groundup/library/return.php on line 88
Call Stack
#TimeMemoryFunctionLocation
10.0001234728{main}( )../index.php:0
20.0084319456returnLink( )../index.php:57

( ! ) Warning: file_get_contents(): Filename cannot be empty in /local/data1/hosts/as/htdocs/resources/explorations/groundup/library/return.php on line 91
Call Stack
#TimeMemoryFunctionLocation
10.0001234728{main}( )../index.php:0
20.0084319456returnLink( )../index.php:57
30.0085319640file_get_contents ( )../return.php:91

( ! ) Notice: Undefined variable: title in /local/data1/hosts/as/htdocs/resources/explorations/groundup/library/return.php on line 94
Call Stack
#TimeMemoryFunctionLocation
10.0001234728{main}( )../index.php:0
20.0084319456returnLink( )../index.php:57
Return to “Telescopes from the Ground Up”