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What is the difference between a laser light and the light given off a filament lamp?
Wiki User
∙ 12y ago
Laser light is said to be coherent; regular light such as the type produced by an incandescent bulb is incoherent. In coherent light, all the wavelengths are the same, and all the directions are the same, everything lines up and is perfectly uniform. With incoherent light, you get a messy mixture of wavelengths and directions.
Light from a laser is collimated - i.e. aligned such that all the light rays are oriented parallel to each other. For this reason, you do not see laser light unless some of it is deflected by striking a something in its path or you are looking directly at it. In a filament lamp, the light rays are oriented in nearly all directions.
Wiki User
∙ 12y ago
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