Chapter 6 Telescopes: Portals of Discovery. 6.1 Eyes and Cameras: Everyday Light Sensors. Our goals for learning How does your eye form an image? How do we record images?. How does your eye form an image?. Refraction.
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Digital cameras detect light with charge-coupled devices (CCDs)
Close-up of a star from the Hubble
The resolution angle is q, the wavelength is l, and D is the diameter of the objective, the aperture.
Twin Keck telescopes on
Mauna Kea in Hawaii
Segmented 10-meter mirror of a Keck telescope
only one star
Turbulent air flow in Earth’s atmosphere distorts our view, causing stars to appear to twinkle
Same star viewed with Hubble Space Telescope
Star viewed with ground-based telescope
Rapidly changing the shape of a telescope’s mirror compensates for some of the effects of turbulence
Without adaptive optics
With adaptive optics
Summit of Mauna Kea, Hawaii
Very Large Array (VLA)