Colour

• What is white light?

  A mixture of all the different colours
• What happens if we pass white light through a prism?

  It splits into a spectrum
• What does each colour within the visible spectrum have?

  Its own narrow band of wavelength and frequency
• What happens when an opaque object appears coloured?

  It is reflecting light of that particular wavelength and absorbing other wavelengths
• What happens to an object if it reflects all wavelengths equally?

  It appears white .
• What happens to an object if all wavelengths are absorbed?

  It appears black .
• How do coloured filters work?

  They absorb some wavelengths and transmit (allowing through) other wavelengths
• A colour filter does not change colour
• If the filter is the same colour as the object, the object will appear its true colour
• What happens if a red an blue striped object is seen through a red filter?

  The object will appear red and black because the filter will allow the red light through but not the blue light
• What happens if a red and blue striped light is seen through a filter?

  The object appears completely black as the filter will not allow red or blue light to pass through it