Physics:Interference of Light
When clear colourless oil spreads out into a thin film on water it reflects all the colours of the rainbow. A shell gets its colours from many thin clear layers. When a clear soap film is stretched thinly it too becomes coloured. When white light shines on cracks in a clear crystal it too reflects colours. A thin film of air between plates produces Newton's rings. All these phenomena are caused by the interference of light and are evidence that light acts as a wave. For interference is a property of waves.
- Added：2006
- Country：Australia
- Duration：18
- Time of update：2011/3/11 15:03:55