John Wheeler proposed a modified thought experiment based on this investigation in which the observer can choose the method of measuring the result, and is called the "delayed choice" experiment. A variant of this experiment performed by Shariar Afshar involved a grid of wires placed before a lense, and it was first performed with electrons by Claus Jonnson. Setups in which one of the paths is closed off provides an illustration of Bohr's complementarity principle, and in its original form, light passing through the namesake setup produced a se
John Wheeler proposed a modified thought experiment based on this investigation in which the observer can choose the method of measuring the result, and is called the "delayed choice" experiment. A variant of this experiment performed by Shariar Afshar involved a grid of wires placed before a lense, and it was first performed with electrons by Claus Jonnson. Setups in which one of the paths is closed off provides an illustration of Bohr's complementarity principle, and in its original form, light passing through the namesake setup produced a series of interference fringes. It was the first experiment to demonstrate the wave-nature of light. For 10 points, identify this experiment which was performed by a British Egyptologist. 
John Wheeler proposed a modified thought experiment based on this investigation in which the observer can choose the method of measuring the result, and is called the "delayed choice" experiment.
Young's {double slit} experiment