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Unexpected Attraction of Polarotactic Water-Leaving Insects to Matt Black Car Surfaces: Mattness of Paintwork Cannot Eliminate the Polarized Light Pollution of Black Cars

Figure 2

Photograph, patterns of the degree of linear polarization d and the angle of polarization α (clockwise from the vertical), and areas detected as water by polarotactic insects (for which the reflected light has the following characteristics: d>15%, 80o<α<100o) of a matt black car measured with imaging polarimetry from five different directions of view in the blue (450 nm) part of the spectrum.

The angle of elevation of the optical axis of the polarimeter was −20o from the horizontal. The number-plate of the car is screened by a white rectangle.

Figure 2