| 摘要 |
Optical system capable of producing the Fraunhofer diffraction by arranging a diffraction grating RD1 comprising thin sheets of methyl polyacrylate arranged adjacent to each other and supported by thin sheets of polystyrene having a dark color so that they can produce the Fraunhofer diffraction. Thus the solar rays R which emerge in parallel from the diffraction grating RD1, are directed towards the convergent lenses L and form as an image, a point or line which is characteristic of the Fraunhofer diffraction on the diffraction grating RD2 organized in the same way as the diffraction grating RD1. As a result, the solar rays R go through the diffraction grating RD2 and emerge parallel to the parabole axis P and concentrate on a point or line in the conduit T focus of the parabole P. |
