AStronomy 2 - Lens size is limited ▪ Reflecting Telescope...

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Three types of spectra Continuous spectrum Emission line spectrum Absorption line spectrum Light tells us what thigns are made of every atom has a fingerprint Telescopes Catching images Recording images Two important properties of a telescopes The light collecting area The larger the telescope, the better Angular resolution The ability two see things that are extremely close together and able to tell them apart Two basic telescope designs Refracting telescopes Lens focuses light onto the focal plane Advantages: More sturdy than reflecting Rarely needs cleaning air currents and effects due to temperature change Disadvantages: All retractors suffer from chromatic aberration Causes small rainbows when looking through the telescope
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Unformatted text preview: Lens size is limited ▪ Reflecting Telescope • Concave mirror focuses light onto the focal plane ◦ Advantages: ▪ No chromatic abberation ▪ Support for the mirror is along the back side so can be huge ▪ Reflector telescopes are cheaper ▪ Lights reflecting off the object, rather than passing through it ◦ Disadvantages ▪ Easy to get off alignment ▪ High maintenance ◦ Focusing ▪ A lens refracts the light into one focal point ◦ Telescope's job is to collect light ▪ The lens bends the light to focus; image appears on a focal plane ▪ Image is recorded ◦ Telescopes are designed to collect photons in a particular band of the electromagnetic spectrum ◦ Different types of telescopes ▪ Radio ▪ Infrared ◦...
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This note was uploaded on 09/08/2010 for the course ASTR 101 at San Jose State.

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AStronomy 2 - Lens size is limited ▪ Reflecting Telescope...

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