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      <image:title>650nm Red Laser Module (Class II)</image:title>
      <image:caption>Quarton VLM-650-21 LPT Class II laser module with aspherical plastic lens for 650nm diffraction experiments</image:caption>
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      <image:title>Refraction Demonstration Tank</image:title>
      <image:caption>Acrylic refraction tank with 650nm laser showing incident and refractive ray paths</image:caption>
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      <image:title>650 nm Laser Diffraction Research Kit — Solo (1 Observer)</image:title>
      <image:caption>Solo Research Kit — a single 650nm laser line across a dark wall for one observer</image:caption>
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      <image:caption>650 nm laser module, component of laser diffraction research kit.</image:caption>
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      <image:title>Multi-Wavelength Laser Diffraction Research Kit — Circle (6 Observers)</image:title>
      <image:caption>Circle Research Kit — six laser beams converging on a shared observation mat for six observers</image:caption>
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