DOC PREVIEW
GSU ASTR 1010 - Telescopes

This preview shows page 1 out of 3 pages.

Save
View full document
View full document
Premium Document
Do you want full access? Go Premium and unlock all 3 pages.
Access to all documents
Download any document
Ad free experience
Premium Document
Do you want full access? Go Premium and unlock all 3 pages.
Access to all documents
Download any document
Ad free experience

Unformatted text preview:

ASTR 1010 1st EditionLecture 12Outline of Last Lecture I. The Doppler EffectA. DiagramB. FormulaOutline of Current LectureI. TelescopesA. DefinitionsB. TypesC. DiagramD. PowerE. InterferometryCurrent LectureI. TelescopesA. Definitions- Light collecting area: telescopes with a larger collecting area can gather a greater amount of light in a shorter time. A telescope’s diameter tells us it’s LCA. Area = (d/2)^2d2¿¿Area= x ¿- Angular resolution: The minimum angular separation a telescope can distinguish. The smaller, or better, angular resolution is found with a larger telescope diameter and smaller wavelengths of light.- Magnification: how much larger the image appears in the telescopes vs the sky- Aperture: diameter of the telescope. The bigger the diameter, the more light it gathers in the same time, so it can see fainter objectsB. Types- Refracting telescope: focuses light with lenses. Focal ratio = focal length/lens diameterMagnification = FL (of telescope)/FL (of eyepiece)Ex. FL (t) = 200cm/FL (e) = 2cm, Mag = 100xProblems: o Heavy glass sagso Glass absorbso Two surfaces to polisho Chromatic aberration: colors focus at different distances- Reflecting telescope: focuses light with mirrorso Only one surface to grind and polisho Support mirror in the back to make it largero No chromatic aberrationo Needs a second mirror to reflect light out of tubeC. Diagram- Types of TelescopesD. Power- Resolving power (RP) = 1diameterSmaller = better- Light Gathering Power (LGP) = D2= AreaLarge Diameters = better, finer detailE. Interferometry- An interferometer combines light from several small telescopes to yield the power of a much larger telescope. The larger the separation, the better the results.- Center for High Angular Resolution Astronomy (CHARA)o CHARA: Long term program at GSU to study tiny details in the sky.o Limited by diameter of


View Full Document
Download Telescopes
Our administrator received your request to download this document. We will send you the file to your email shortly.
Loading Unlocking...
Login

Join to view Telescopes and access 3M+ class-specific study document.

or
We will never post anything without your permission.
Don't have an account?
Sign Up

Join to view Telescopes 2 2 and access 3M+ class-specific study document.

or

By creating an account you agree to our Privacy Policy and Terms Of Use

Already a member?