2007-03-17 16:32:59 · 7 answers · asked by Danny 3 1 in Science & Mathematics ➔ Astronomy & Space
700mm refers to the focal length of the telescope...the distance the light travels from the objective lens/mirror to the the point the light converges into an image (usually the eyepiece). With a refractor..that means basically the length of the tube, or some close approximation of that.
However, in the case of a reflector, the length of the tube could actually be shorter if there are multiple mirror involved (this probably not the case with you...700mm is very short for a reflector telescope)
2007-03-17 18:16:26 · answer #1 · answered by star2_watch 3 · 0⤊ 0⤋
This is generally the focal length of the primary --be it a lens as in a refractor, or a mirror in the case of a reflector. It measures the distance from the primary to that point where the light entering the telescope is brought to a point.
700mm is 27.56 (rounded) inches.
HTH
Charles
2007-03-17 23:56:19 · answer #2 · answered by Charles 6 · 1⤊ 0⤋
when someone says 700mm telescope, they are referring to the width of the lense or mirror. there are 1000mm in a meter, so it is a little under 3 ft wide.
2007-03-17 23:41:17 · answer #3 · answered by Anonymous · 1⤊ 0⤋
A meter is 1000 mm ( or ~ 39 inches) so a good estimate would be about 30 inches
2007-03-17 23:42:56 · answer #4 · answered by lynn y 3 · 0⤊ 0⤋
27 9/16 inches.
2007-03-17 23:41:47 · answer #5 · answered by Anonymous · 0⤊ 0⤋
28 "
2007-03-18 00:55:13 · answer #6 · answered by Anonymous · 0⤊ 0⤋
Charles got it before me, but it is the focal length.
2007-03-18 00:44:42 · answer #7 · answered by orion_1812@yahoo.com 6 · 0⤊ 0⤋