Pen: Lazer

: 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 chamber bounce these photons back and forth, creating a chain reaction that intensifies the light. lazer pen

: A tiny semiconductor that converts electricity into light. : A lens at the tip focuses the

: 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. : Appears much brighter to the human eye

The term "laser" is an acronym for . Inside the sleek casing of a laser pen, several components work in unison:

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