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physics

1. universe contains all the galaxies

   • geocentric : everthing orbits the earth
     • heliocentric: all planets orbit the sun

2. galaxy: collections of billions of stars

3. our is the milky way

4. focal lenght: distance from lens to the screen when image is in focus

5. frequency:number of waves per second measured in hertz(HZ)

6. wave lenght : the lenght of a single wave from one crest to the next measured in(M)

7. eclectromagnetic spectrum: transverse waves that all travel at the same speed in a vacuum

8. eyepiece lens: magnifies an image (convex lens)

9. wave speed: how quickly a wave moves through a medium(m/s)

10. a medium is a material

11. real image:inverted (upside down)

    • can be projected on a screen
      • objective lens

12. wave: a vibration that transfers energy but not matter

13. refraction: a change in speed (at ab boundary)

    • which causes a change in directon