Regular Light VS Laser Light

Regular light has many colors, or wavelenghts, mixed together, creating white light. The light waves spread out as they travel.

Laser light is of the same wave length,with all the waves in phase, or in step, with one another. A laser is always a single color because the waves are the same length. Beacase the waves are parallel, a laser light stays in a tight beam for long distances.

One of many everyday applications for laser is as pointing devices. Most commercial laser pointers have a power limt of five milliwatts.(A milliwatt is 1000th of a watt. A standard light blub might be 75 watts.) But because laser light is focused, a small amount of power can project a laser pointer's beam up to two miles, depending on atmospheric conditions. Brief exposure to a laser of this power cannot burn or cause permanent damage. A laser pointer beam shined into the eye could cause disorientation, temporary blindness or loss of night vision.

Posted on : 2008-7-24　【Return】