Optical and Reflective Characteristics Measurement and Focal Length Calculation of a Hollow Tetrahedral Corner and a Solid Highly Retroreflective Cubes

<p>The Retroreflection index<b> R</b>[M<sup>2</sup>/Str] versus the focal length<b> f</b>.</p>

International Journal of Optics

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Figure 5

Figure 5: Optical and Reflective Characteristics Measurement and Focal Length Calculation of a Hollow Tetrahedral Corner and a Solid Highly Retroreflective Cubes 

Figure 5 | Optical and Reflective Characteristics Measurement and Focal Length Calculation of a Hollow Tetrahedral Corner and a Solid Highly Retroreflective Cubes 