Visible Light & the Solar System

Visible Light & the Solar System

1. P1.1 The Solar System

   • observations
     • radio waves
     • naked eye
     • telescopes
     • photographs
     • microwaves
   • changing ideas
     • old - geocentric
     • new - heliocentric
   • Galileo
     • used telescopes & saw 4 moons around Jupiter
       • supported heliocentric model

2. P1.2 Refracting Telescopes

   • refraction
     • speed changes when it goes into a different material
       • changes direction
   • lenses
     • fatter lens=shorter focal length
       • found by focusing rays onto paper
         • focal length=distance from lens to paper
   • telescopes
     • objective lens forms image
     • eyepiece lens magnifies image

3. P1.4 Reflecting Telescopes

   • reflection
     • light bounces off boundary
   • telescopes
     • primary mirror focuses rays
     • eyepiece lens magnifies image

4. P1.5 Waves

   • waves
     • transfer energy+info not matter
     • frequency=no. waves passing a point per second
   • calculations
   • types
     • longitudinal
       • sound
       • seismic P waves
       • particles travel in same direction as wave
     • transverse
       • electromagnetic
       • seismic S waves
       • particles travel perpendicularly to wave direction

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