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Light and Telescopes

Light and Telescopes. Light. Light as a Wave. Light as a Wave. Thermal Radiation. Thermal Radiation. Stefan-Boltzmann Law. Wien’s Law. Continuous Spectrum. How light and matter interact. Emission – matter transmits some of its energy to a photon

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Light and Telescopes

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  1. Light and Telescopes

  2. Light

  3. Light as a Wave

  4. Light as a Wave

  5. Thermal Radiation

  6. Thermal Radiation Stefan-Boltzmann Law Wien’s Law

  7. Continuous Spectrum

  8. How light and matter interact • Emission – matter transmits some of its energy to a photon • Absorption – a photon transmits its energy to matter • Transmission – some matter allows light to pass though • Reflection/Scattering – light bounces off matter and travels in a different direction

  9. Atoms

  10. Atomic Energy Levels

  11. Continuous Spectrum

  12. Absorption Spectrum

  13. Absorption Spectrum

  14. Emission Spectrum

  15. Doppler Shift

  16. Doppler Shift

  17. Telescopes

  18. Collecting Area r Area = π r2 2r Area = π (2r)2 = 4 π r2

  19. Angular Resolution θ (

  20. Refracting Telescope

  21. Reflecting Telescope

  22. Telescopes through the Spectrum

  23. Radio Telescope

  24. X-ray Telescope

  25. Difficulties with Observing • Light pollution • Atmospheric Turbulence • Atmospheric Absorption • Can be solved by going to space, adaptive optics, more powerful equipment and other clever techniques

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