Reflecting telescopes are popular becouse they're?

Question

A. more powerful than a refracting telescope.
B. smaller than a refracting telescope.
C. easier to buid than a refracting telescope.
D. more durable than a refracting telescope.

Answer 1

Reflecting telescopes provide a good focus, where a refracting telescope splits up the colors the way a prism does, and ruins the focus.

Answer 2

If in fact one were to undertake to build a telescope, one would certainly select to grind the mirrors of a simple Newtonian reflector rather than attempt to grand the lense of a refractor, but I doubt that that would make it the more popular, so that eliminates C.

Given that both telescope have the same diameter object lens or mirror, they are both equally powerful, so that eliminates A.

A newtonian reflector is certainly not more durable than a refracting telescope the mirrors must be frequently realigned, so that eliminates D.

B is the only answer left and I must agree that is a logical answer because for a given diameter, the reflector will certainly be more compact.

But I believe they are more popular because for a given diameter they are much less expensive. An 8 inch reflector costs about $2000 but an 8 inch refractor would cost a small fortune and require a special building to house.

Answer 3

The main reasons why reflecting telescopes are popular are freedom from chromatic aberration, which causes annoying violet halos around bright objects, and maximum bang for the buck. You can spend 6,000 to 10,000 dollars easily for a top notch 6-inch apochromatic refractor and a GOTO equatorial mounting for it, or you could take the same money and buy a 25-inch or even larger Dobsonian with first rate optics and all the other bells and whistles advanced amateur astronomers want. For 300 to 500 dollars, you can get a smallish achromatic refractor that does the job on bright objects, or a good 6 or 8-inch Dobsonian that can introduce you to the Universe at large.

Answer 4

B
A reflecting telescope is a refracting scope it just has mirrors in them to make it shorter and lighter, so thus are more durable

Answer 5

A and C sort of. They are cheaper to make and lighter per inch of aperture.
The more aperture you have the more light you can gather. Objects are brighter and you can see more of the dimmer objects. The draw back is you will need to align the primary mirror to the secondary each time you use it.

Answer 6

B and C certainly.
A if you have any considerations of the cost(s) involved.
C unless you know how to make very durable and 'rigid' mounting tubes for the lenses.


Doug

Answer 7

None of the above. The larger diameter of the tube means more light comes in. More light = brighter, clearer image.

Answer 8

The correct answer is C. Easier to build than a refracting teloscope

Answer 9

I would say B

Answer 10

A and C.