: Mirrors at either end of a small chamber bounce these photons back and forth, creating a chain reaction that intensifies the light.
: When electricity hits the diode, it excites electrons, which release photons (light particles). lazer pen
Laser pens come in various colors, each with different properties: : Mirrors at either end of a small
: A tiny semiconductor that converts electricity into light. it excites electrons
: A lens at the tip focuses the scattered light into a tight, parallel beam that stays concentrated over long distances. A Spectrum of Colors
: Appears much brighter to the human eye because our vision is most sensitive to the green spectrum. These are popular for stargazing as the beam is often visible in the air.