Astronomy Chapter 6
how are objects viewed in a telescope for refracting
upside down
What is the Hubble telescope resolution
.05 arcseconds
What is the ability to separate two objects that are very close together?
Angular resolution
When astronomers talk about using a telescope to make details much clearer they are talking about
Angular resolution
What is refraction?
Bending of light
What are some problems with refracting telescopes?
Big lenses are hard to make Different colors of life bend by different amounts Heavy Flip the images causing confusion
If our eyes were sensitive only to X rays, the world would appear __________.
Dark because x-rays do not reach the earths surface
How do you get a better telescope resolution?
Have a bigger objective
If you only had one telescope and wanted to take pictures of both ultraviolet light and visible light, what would be the best location of the telescope and why?
In space because UV ONLY penetrates the earths atmosphere.
What is the James Webb Telescope being built to primarily see?
Infarred
What are the advantages of using reflecting telescopes?
Only have to clean one side of a mirror while you have to clean both sides of a lens for refracting telescopes Mirror can be supported from its back while lenses have to have both front and back cleared
What are telescopes that use mirrors called?
Reflecting telescope
angular resolution
The ability of a telescope to distinguish between adjacent objects in the sky. To see more detail (larger is better)
What different wavelengths of light can partially penetrate the earths atmosphere and reach the surface?
UV and Infarred
What wavelengths can be seen at sea level with a telescope?
Visible and Radio
What different wavelengths of light are able to completely penetrate the earths atmosphere and reach the surface?
Visible and radio
What different wavelengths of light are completely absorbed in the earths atmosphere and never reach the surface?
X-Rays and Gamma?
Interferometry uses two or more telescopes to achieve
an angular resolution equivalent to a much larger telescope
what best describes the difference between reflecting and refracting telescopes
refracting uses a transparent glass lenses to focus light reflecting uses mirrors to focus light
objective of a telescope
the lens in a telescope