retroreflectors
Beam return devices
Retroreflectors are surfaces or devices that reflect light back toward its source, regardless of the angle at which it arrives.
They work through prisms or tiny glass beads arranged so incoming light bounces back along its original path.
Retroreflectors appear on road signs, bicycle reflectors, safety vests, and vehicle taillights.
NASA placed retroreflectors on the moon to measure Earth-moon distance using laser beams.
Light-splitting optical element
- sphericalGlobe-like in form
- beadPierced ornament for threading
- lensLight-focusing curved glass
- reflectivityLight-bouncing capacity
photometric · diffuser · coefficient · brightness · wide-angle · refraction · aperture
Precision angle-measuring instrument
- prismLight-splitting optical element
- geodesyEarth measurement science
- photogrammetryDeriving measurements from photographs
- targetObject of pursuit
tripod · benchmark · Apollo · precision · alignment · calibration · satellite · GPS
Major road for travel
- cat's-eyeLight-catching road marker
- delineatorSomething that marks boundaries
- guardrailRoadside safety barrier
- signagePosted public displays
centerline · chevron · intersection · crosswalk · barrier · cone · roadwork
prism
Light-splitting optical element
reflectivity · photometric · diffuser · coefficient · brightness · wide-angle · refraction · aperture
theodolite
Precision angle-measuring instrument
- prismLight-splitting optical element
- geodesyEarth measurement science
- photogrammetryDeriving measurements from photographs
target · tripod · benchmark · Apollo · precision · alignment · calibration · satellite · GPS · positioning
highway
Major road for travel
- cat's-eyeLight-catching road marker
- delineatorSomething that marks boundaries
- guardrailRoadside safety barrier
signage · centerline · chevron · intersection · crosswalk · barrier · cone · roadwork
vest
Sleeveless upper-body garment
jogger · pedestrian · backpack · jacket · stripe · patch · sticker · harness · high-visibility · nighttime
taillight
Vehicle's back signal
trailer · bicycle · motorcycle · bumper · amber · red · white · mounting · adhesive