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Exploring Light and Optics: Telescopes and the Electromagnetic Spectrum

This article delves into the physical properties of light, including refraction and reflection, and how they play critical roles in astronomy. It highlights the significance of different wavelengths and frequencies within the electromagnetic spectrum and their impact on our understanding of the universe. From historic telescopes like Yerkes Observatory to modern marvels such as the Very Large Telescope and large radio arrays like Arecibo, we explore how advancements in optics have propelled astronomical discoveries. Learn about the cutting-edge technology enabling us to see beyond visible light, including UV, X-ray, and gamma-ray observations.

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Exploring Light and Optics: Telescopes and the Electromagnetic Spectrum

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  1. Light, Optics and Telescopes The Electromagnetic Spectrum

  2. Photons of different energies radiate at different wavelengths or frequencies wavelength x frequency = velocity of light ( c) l n = c c = 5 x 105 km/s c = 186,000 miles/s

  3. Atmospheric Windows Visible and radio

  4. Physical Properties of Light Refraction

  5. Refraction is wavelength dependent Reflection

  6. Formation of an image

  7. Telescopes -- Refractors Yerkes Observatory – Lake Geneva, Williams Bay Wisconsin

  8. 20th Century Large Reflectors Mt Wilson 100-inch – 100 yrs old Palomar 200-inch Cerro Tololo 4 -meter

  9. Modern Observatories Cerro Tololo Interamerican Obs.

  10. Kitt Peak National Obs. Tucson Arizona

  11. Very Large Telescopes Mauna Kea ESO – VLT

  12. MMT on Mt. Hopkins, AZ

  13. Minnesota’s $5M (private) investment in a very large telescope (> $100M) Large Binocular Telescope (LBT) Mt. Graham Arizona Design Other partners -- University of Arizona, Germany, Italy, Ohio State University, University of Virginia, Notre Dame

  14. Radio Telescopes

  15. Arecibo Very Large Array – VLA

  16. Telescopes in Space -- other wavelengths – UV, X ray, gamma ray and far-IR

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