Demonstration Experiment
The effect can be simply observed by using a laser. First place a thin (approx 0.1 mm) wire into the laser beam and observe the diffraction pattern. Then observe the diffraction pattern when the laser is shone through a narrow slit. The slit can be made either by using a laser printer or photocopier to print onto clear plastic film or by using a pin to draw a line on a piece of glass that has been smoked over a candle flame.
Read more about this topic: Babinet's Principle
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