Each telescope has its own advantage, for instance the
refractor is better for observing the planets
and the moon and the reflector for deep-sky objects (e.g. galaxies). However, the refractor suffers from what is known as chromatic aberration.
Do astronomers prefer reflecting or refracting telescopes?
Astronomers prefer
reflecting telescopes
Do astronomers use reflecting or refracting telescopes?
A
refractor
uses lenses within a tube to refract (bend) light. It's the type of long telescope which you might imagine old-time astronomers, like Galileo, using. Reflectors, on the other hand, use mirrors instead of lenses to reflect light. Most modern observatories use reflectors because their telescopes are so huge.
Do professional astronomers use reflecting telescopes?
These limitations are two reasons that most professional astronomers use reflecting telescopes. … Therefore, reflecting telescopes
allow all colors of light from an object to be seen in focus at the same time
. Very large telescopes. several mirrors work together to collect light and focus it in the same area.
Why do astronomers use refracting telescopes?
The earliest telescopes, as well as many amateur telescopes today,
use lenses to gather more light than the human eye could collect on its own
. They focus the light and make distant objects appear brighter, clearer and magnified. This type of telescope is called a refracting telescope.
What are the disadvantages of a refracting telescope?
- Very high initial cost relative to reflector.
- A certain amount of secondary spectrum (chromatic aberration) unavoidable (reflector completely free of this) The colours cannot focus at one point.
- Long focal ratios can mean that the instrument is cumbersome.
What are the disadvantages of a reflecting telescope?
Reflecting telescopes have a few disadvantages as well. Because they are normally open, the mirrors have to be cleaned. Also,
unless the mirrors and other optics are kept at the same temperature as the outside air, there will be air currents inside the telescope that will cause images to be fuzzy
.
What type of telescope can work 24 hours a day and even be used in the rain?
Hubble
, the observatory, is the first major optical telescope to be placed in space, the ultimate mountaintop. Above the distortion of the atmosphere, far far above rain clouds and light pollution, Hubble has an unobstructed view of the universe.
What is the biggest advantage of a reflecting telescope?
The main advantage is reflector telescope
can escape from chromatic aberration because wavelength does not
effect reflection. The primary mirror is very stable because it is located at the back of the telescope and can be support in the back. More cost effective than refractor of similar size.
Are reflecting telescopes used today?
Reflecting telescopes are also called
reflectors
. Most telescopes used by astronomers today are reflectors. In Newtonian telescopes, one mirror is used to capture the image while another mirror is used to reflect the image from the first mirror.
How much more light collecting area does a 10 inch telescope have than a 5 inch telescope?
Answer: The 10 meter telescope has
4 times
as much light collecting area as the 5 meter telescope.
Why do telescopes have to have a good motorized drive system to move them quickly and smoothly?
Since Earth is rotating
, the telescope must have a motorized drive system that moves it very smoothly from east to west at exactly the same rate that Earth is rotating from west to east, so it can continue to point at the object being observed.
What limits the size of a refracting telescope?
The size of a refracting telescope, and hence its light gathering power, is limited by
the size of the largest lens that you can make
: Larger lenses are heavier, and tend to sag under their own weight, ruining the image quality as the lenses distort.
What are 2 problems with refracting telescopes?
The two problems with refracting telescopes are
a chromatic aberration and spherical aberration
.
What type of telescope is best for viewing planets?
Both
refractor and reflector telescopes
What are the pros and cons of a refracting telescope?
| Pros Cons | Impressive contrast and sharpness Light and transportable Closed tube = protection against humidity and dust Maintenance and cleaning almost nonexistent Small diameter = less light collected Chromatic aberrations Higher price |
|---|
