reflection of light

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  • Reflection of light
    • transverse wave
    • speed of light: 3.0X10^8m/s
    • light travels in straight lines
    • ray
      • represented: straight line with an arrow
    • beam
      • bundle of rays
      • 3 types
        • parallel beam
        • divergent beam (fan outwards)
        • convergent beam (merge to a point)
    • colour
      • seen when objects transmit, reflect or absorb light
      • selective reflection
        • only reflects what specific colours
      • opaque->reflect
      • transparent->transmit
      • "mixing"
        • primary colours
          • red
          • blue
          • green
        • subtractive primaries
          • red+blue=magenta
          • red+green=yellow
          • blue+green=cyan
        • complimentary colours
          • blue+yellow=white
          • red+cyan=white
          • green+magenta=white
      • when all colours are absorbed, black is seen
    • laws of reflection
      • incident ray, reflected ray and the normal lie on the same plane
      • angle of incidence =angle of reflection
    • ray diagrams
      • 1) draw object image (dotted lines, mark equal distances
      • 2) draw lines from the "viewer" to the object's image (dotted line)
      • 3) solidify the lines on the side of the mirror the "viewer" is at (solid lines, arrows)

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