Each glass bead works as follows: An incoming light beam refracts as it passes through the front surface of the glass bead and is reflected off the mirrored surface behind the bead again. The beam then passes back through the front surface and returns toward the light source.
Cube corners are retro-reflective lens elements like glass beads. Each cube corner has three mutually perpendicular refractive surfaces.
An incidental light ray is refracted on each of the three surfaces and is returned to its source parallel to its initial direction. It functions like a ball bouncing into the corner of a room.
ISO 20471/ BIS approved IS 15809:2017 INDIAN STANDARDS FOR HI-VISIBILITY
REFLECTIVE CLOTHING AND WORK WEAR
USER GUIDELINES OF HI-VISIBLE JACKETS AS PER INDIAN & INTERNATIONAL STANDARDS
There are 3 discrete levels of risks areas as per ISO 20471 standards for high visibility warning clothing. In accordance, there are 3 different types of high visibility warning clothing that can be used.