: Mirrors at either end of a small chamber bounce these photons back and forth, creating a chain reaction that intensifies the light.
Laser pens come in various colors, each with different properties: lazer pen
: A lens at the tip focuses the scattered light into a tight, parallel beam that stays concentrated over long distances. A Spectrum of Colors : Mirrors at either end of a small
: Typically AAA or lithium-ion batteries that provide the electrical energy. lazer pen