Lazer Pen -

: Typically AAA or lithium-ion batteries that provide the electrical energy.

: A lens at the tip focuses the scattered light into a tight, parallel beam that stays concentrated over long distances. A Spectrum of Colors lazer pen

: Mirrors at either end of a small chamber bounce these photons back and forth, creating a chain reaction that intensifies the light. : Typically AAA or lithium-ion batteries that provide

: 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. lazer pen