Telescopes - cameras - spectrometers
Telescopes
- gather and focus light on detector
- draw diagram of object - lens - image
- All use same principle
- eyeball (lens + retina)
- camera (lens + film)
- telescope (lens + detector)
- Lens popular for small telescopes
- Galileo, binoculars
- Newton troubled by colors
- red bent less than blue -- images colored
- expensive cameras have many lenses in series
- mirror bends all light the same
- Mirrors used for all large telescopes
- works for all wavelengths, from x-ray to radio
- glass is opaque in uv and infrared