light

Cards (23)

  • Light travels
    1. From luminous objects
    2. To non luminous objects
    3. In a straight line
    4. Reflects back to the eyes
  • Transparent

    Allows light through, you can see through (e.g. window glass)
  • Translucent
    Allows some light through but it is scattered, makes object blurry to see through (e.g. tracing paper)
  • Opaque
    Doesn't allow any light through, you can't see through (e.g. book)
  • Incident ray

    The ray of light hitting the glass
  • Angle of incidence
    The angle between the incident ray and the normal
  • Refracted ray

    The light exiting the glass
  • White light is made up of the 7 colours on the spectrum
  • The 7 colours of the spectrum
    • red
    • orange
    • yellow
    • green
    • blue
    • indigo
    • violet
  • red light travels faster in glass than blue light
  • Light can be split using a prism
  • A blue light shining through a red filter will give no light
  • Black isn't a colour. Its absence of light.
  • Dispersion
    The splitting up of white light inte its component colours
  • All colours travel at the same speed in a vaccum (3x10 m/s)
  • White isn't a colour but a mixture of all the colours of the rainbow.
  • Filters absorb some colours of white light and lets other colours through to create coloured light
  • a red filter absorbs all colours except red light
  • a blue filter absorbs all colours apart from blue light
  • a green filter absorbs all colours except a green light. it is used to separate out the green light from the red and blue light
  • a magenta filter absorbs all colours apart from red and blue
  • a cyan filter absorbs all colours except green and blur
  • a yellow filter absorbs all colours except from red and green