Chapter 5 Telescopes: Refracting , Reflecting, Cassegrain.

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Presentation transcript:

Chapter 5 Telescopes: Refracting , Reflecting, Cassegrain. Resolution, LGP, resolving power. Aberration magnification Photometers, Spectrometers (Spectroscopes) Radio telescopes, detectors & interferometry.

Telescopes: Parts of a telescope Uses a mirror to bend light to a focus. Uses a lens to focus light. Telescopes: Parts of a telescope

Telescopes: Cassegrain design

Telescopes: Function & Problem LGP (Light gathering Power) The amount of light a telescope can gather, dependent on size of lens/mirror ( aperture diameter). Resolving Power (angular resolution) – ability of a telescope to form separate, distinct images of objects lying close together in a field of view. Chromatic Aberration: Occurs when a lens bends higher frequency components of visible light more than the lower frequency components. The result is a colored halo around the image. Fig. 5.5, page 111.

Telescopes: lenses vs. mirrors Lenses tend to focus the component frequencies of white light differently, bluer ( high energy) light bends more readily than red (less energy) light, [Chromatic Aberration effect]. Mirrors don’t have this problem. Absorption is a problem for high energy ( IR, UV) radiation traveling through a lens. Does not affect mirrors. Large lenses are quite heavy in contrast to mirrors which can be supported over their back surfaces. A lens has to be carefully polished on 2 surfaces, a mirror has only one surface.

Telescopes: Cassegrain design. In large Reflecting telescopes, the tube length can be quite long. The Cassegrain design overcomes this problem because the extra light path allows for a shorter tube. The Coma effect: When not all light is focused properly to a fine point. The Cassegrain design allows for a correcting lens (plate) to correct this effect by bending the incoming light. Incoming starlight Primary mirror Correcting lens

fe – eyepiece focal length Magnification M = f0/fe Where f0 – objective focal length fe – eyepiece focal length fe f0