Abstract
This paper describes that the Fraunhofer diffraction patterns, which are generated by the slit aperture formed between a reference knife edge and a polished metal cylinder, are influenced by light reflected from the cylinder surface. An incident and diffracted light is partly reflected at the cylinder surface. To analyze the influence of reflected light, the diffraction patterns are simulated by using a personal computer. The intensity distribution of diffraction pattern used the turned cylinder is measured with a phto-detector. The experimental results agree well with the simulated patterns. When the slit aperture width is reduced, the position of the zeroth diffraction light maximum intensity moves from the center of slit aperture to the direction of the knife edge on the observation plane. The Fraunhofer patterns are mainly influenced by the reflection of the diffracted light.
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