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Light (Rays and Beams (Divergent beams, Convergent beams, Parallel beams, …

- - - - Laterally inverted (right corresponds to left)
      - Object distance is equal to image distance
      - Image is same size as the object
      - The image is upright
      - 1) Locate the image of the object
        2) Draw the reflected ray to the eye from I
        3) Draw the incident ray from the object to the mirror
        4) Repeat steps 2&3
  - - - Normal- line perpendicular to the reflecting surface
        Angle of incidence (i)- angle between the normal and the incidence ray
        Angle of reflection(r)- angle between normal and the reflected ray
        
        1) Angle i= Angle r
        
        2) The incident ray, reflected ray and the normal at the point of incidence all lie in the same plane (flat surface)
- - - - Primary colours: Red, Blue and Green
        
        Red + Blue = Magenta
        
        Blue + Green = Cyan
        
        Red + Green = Yellow
        
        E.g. Yellow objects: red, green , yellow light rays
        
        A red apple under blue light appears black because it absorbs all light except red.
      - Coloured filters:
        A red filter allows red light through and absorbs the other colours.