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Reflector has retroreflector and filter unit upstream of retroreflector, which is permeable to light within certain wavelength area and is non-permeable to light of other wavelength area
Reflector has retroreflector and filter unit upstream of retroreflector, which is permeable to light within certain wavelength area and is non-permeable to light of other wavelength area
The reflector has a retroreflector (1) and a filter unit (2) upstream of retroreflector, which is permeable to light within a certain wavelength area and is non-permeable to light of other wavelength area. The optical filter unit is constituted such that the light of other wavelength area is reflected from the optical filter medium. The optical filter medium and the retroreflector is connected such that the light is reflected by optical filter medium.
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