10. Telescopes - 11-TelescopesOutlineOur goals for this...

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Unformatted text preview: 11-TelescopesOutlineOur goals for this section:To become familiar with the two most important properties of modern telescopes: resolution and light-gathering powerTo discuss the motivations for building telescopes on the ground vs. in spaceTo learn about some of the most advanced modern telescopes11-The primary function of a telescopeis to collect as much radiation as possible from a given region of the sky and concentrate it into a focused beamTelescopes come in a whole bunch of different types, some general-purpose, some built specifically for one type of observationEach wavelength range (visible or optical, infrared, radio, X-ray) uses different technologyVirtually no major telescope uses lensesany more; instead they use various kinds of mirrorsTelescope Basics11-REFRACTORS are no longer used much.All large modern telescopes are reflectors.11-When most people think of a telescopes power, they think of magnificationMagnifying power is actually the least important of three powers of a telescopeTelescope PowersThe Three Telescope Powers1. Magnification:the magnifying power of a telescope refers to its ability to make distant objects appear larger. 2. Light-gathering power:the light-gathering power of a telescope is a measure of how much of the light from a given source that the telescope can capture.capture....
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This note was uploaded on 03/01/2011 for the course ASTRO 1a03 taught by Professor Samantha during the Spring '11 term at McMaster University.

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10. Telescopes - 11-TelescopesOutlineOur goals for this...

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