10
Optical
Telescopes and Cameras
•Properly
curved lenses and mirrors can form “Images”
–All the light
leaving one point on object gets “reassembled” at one point on the image.
•In a camera
you put film or an electronic sensor at the image to record it.
•In a
telescope you put a magnifying glass (an eyepiece) near the image to see a magnified version of it.
•Most astronomers don’t spend much time looking
through telescopes
– they put recording devices at the image and use them as large cameras.
– they put recording devices at the image and use them as large cameras.
From our text: Horizons, by Seeds