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beam makes a big difference, and there's one more dif­ference to be mentioned. Most beams of light, like the car headlamps, for example, are continuous. They shine all the time. *But the laser beam is intermittent, and it's off much longer than it's on. *Because these switches on and off are very last, the eye doesn't see them. *While the laser beam is off the energy for the next flash is building up, and when it comes, it's a very intense flash indeed. So lots of power can be packed into a laser beam. Besides that, an ordinary beam of light diverges. *It gets wider and wider, and therefore dimmer and weaker as it goes on. But a laser beam doesn't diverge in this way. So it carries its energy in a compact form, until it's absorbed when it strikes something opaque [ou'peik] (светонепроницаемый).