## Fraunhofer Diffraction Geometry
Note: To obtain the expression for the displacement y above, the small angle approximation was used. | Index Diffraction concepts Fraunhofer diffraction | ||||||||

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## Single Slit Diffraction for Different Slit WidthsThese single slit diffraction patterns were photographed with a helium-neon laser as the light source and a micrometer-controlled single slit. The sketches of the slit widths at right were scaled to the difference between the first minima of the diffraction patterns. If the geometry is such that the small angle approximation is valid, the width of the pattern is inversely proportional to the slit width.
| Index Diffraction concepts Fraunhofer diffraction | ||||||||

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