Lecture 6 - Telescopes

Lecture 6 - Telescopes - Telescopes ASTRONOMY 3 Lesson 6 1...

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Unformatted text preview: Telescopes ASTRONOMY 3 Lesson 6 1 The Very Large Telescope of the European Southern Observatory projecting a Laser Guide Star into the sky (left), and an aerial view of the Mauna Kea observatory by Richard Wainscoat (right) - see http://www.ifa.hawaii.edu/mko/about_maunakea.htm for more information. NATURE of the Universe Review of Lesson 5 Astronomy - Telescopes • Light has both wave and particle properties. Individual quanta (photons) transmit discrete amounts of energy. Blue photons (shorter wavelength) have a higher energy than red photons (longer wavelength). • Individual atoms produce characteristic emission and absorption lines. This enables us to investigate the composition of distant objects like stars or galaxies. • Light from approaching objects is blue-shifted, light from receding objects is red-shifted. 2 NATURE of the Universe Questions from Lesson 5 Astronomy - Telescopes Think about (questions from Lesson 5): • What are the beneFts of using a telescope compared to studying the sky with your eyes? • Why keep astronomers building larger and larger telescopes? 3 • How do telescopes work? (Ch 3.1) • What level of detail can we see? (Ch 3.3) • Optical and Radio Telescopes (Ch. 3.2, 3.4) • Astronomy in the infrared and at high energies (Ch. 3.5) • Summary & Homework NATURE of the Universe Today’s Topics Astronomy - Telescopes see also Lab 3 on “Light I: geometric optics and the telescopes” 4 NATURE of the Universe How do telescopes work? Astronomy - Telescopes Why do we need telescopes? • Collect light • Concentrate light • Observe at wavelengths outside the visible part of the electromagnetic spectrum How do telescopes collect and concentrate light? 5 NATURE of the Universe How do telescopes work? Astronomy - Telescopes Telescopes either use refecting mirrors .... 6 NATURE of the Universe How do telescopes work? Astronomy - Telescopes ... or refraction lenses 7 NATURE of the Universe How do telescopes work? Astronomy - Telescopes ... or refraction lenses 7 NATURE of the Universe How do telescopes work? Astronomy - Telescopes There are two basic types of telescopes: • ReFecting telescope collect the light with a mirror . • Refracting telescopes collect the light with a lens . 8 NATURE of the Universe How do telescopes work? Astronomy - Telescopes How do telescopes create an image? 9 NATURE of the Universe How do telescopes work? Astronomy - Telescopes All modern telescopes used in astronomy are refecting telescopes • Lenses show chromatic eFFects, i.e. light with diFFerent colors is not Focused into the same spot (the lens acts like a prism!) • Lenses can only be support at the edges. • Thick lenses absorb some oF the light....
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This note was uploaded on 10/13/2008 for the course ASTR 3 taught by Professor Hauser during the Fall '07 term at UCLA.

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Lecture 6 - Telescopes - Telescopes ASTRONOMY 3 Lesson 6 1...

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