Reflecting telescopes don't contain a
a. plane mirror.
b. concave mirror.
c. convex lens.
d. concave lens.
2007-02-21 11:11:21 · 5 answers · asked by thedogman b 1 in Science & Mathematics ➔ Astronomy & Space
I know for a fact its one of the lenses..but which one.. I forgot
2007-02-21 11:12:40 · update #1
concave
2007-02-21 11:14:41 · answer #1 · answered by stargazergurl22 4 · 0⤊ 0⤋
c and d are both correct. Basic reflecting telescopes have no lenses at all, except in the eyepiece (or instrument package). Eyepiece lenses can be and are of many types (not just concave and convex).
Schmidt-Cassgrain reflectors do have a lens in front but it is neither concave nor convex but is referred to as a corrector plate.
FYI, not all reflectors have a plane mirror either. Again, it depends on the specific type of reflector. Classic Newtonian reflectors use a plane mirror for the secondary mirror. Cassegrain reflectors do not have plane mirrors but rather use a convex secondary mirror.
I hope your teacher realizes all these nuances and didn't just ask you a question with not very clear answers.
2007-02-21 19:31:10 · answer #2 · answered by Anonymous · 0⤊ 1⤋
D - Reflecting telescopes do not contain a concave lens.
They contain a concave mirror (Primary mirror)
They contain a plane mirror (Secondary mirror)
They contain a convex lens (Eyepiece)
A Cassegrain is not a reflector telescope, it is a cadioptric telescope.
2007-02-21 19:58:38 · answer #3 · answered by Stewart 2 · 0⤊ 1⤋
All these can be included in any type of reflecting telescope, if you include eyepieces and a plane mirror for an eyepiece diagonal (as opposed to a prism, which is much more common).
2007-02-21 20:28:43 · answer #4 · answered by David A 5 · 0⤊ 1⤋
here's a link on ebay where you can read reviews of them by ebay members
2007-02-23 15:37:00 · answer #5 · answered by Anonymous · 0⤊ 0⤋