CLEAN: German IT sector in bullish mood at world's top tech fair

The video tutorial discusses the concept of reflectivity in different materials, highlighting its importance in various applications such as remote sensing and security. It uses the example of road signs to explain how reflectivity works, emphasizing the need for light to be reflected back in the direction of the source. The tutorial also covers the process of measuring reflectivity to determine the best materials for specific purposes, with a focus on practical applications.

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