-
506989
Caption: The Gregorian telescope uses two concave mirrors to focus images in a short telescope tube
Artist: Encyclopaedia Britannica
Release: Not Applicable
File Size: 16.17 MB
-
506796
Caption: Illustration of a Cassegrain reflector
Artist: Encyclopaedia Britannica
Release: Not Applicable
File Size: 16.17 MB
-
6611
Caption: Businessman with a periscope for a head
Artist: Christopher Zacharow
Release: Not Applicable
File Size: 61.86 MB