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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.

In what scenarios might reflectivity be important for security purposes?

How does the concept of reflectivity apply to road signs at night?

What are the characteristics of light that should be reflected towards the observer?

What is the significance of measuring reflectivity in different materials?

Describe the process of how Robert measures reflectivity.