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