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Distance is measured based on the Doppler effect. This has to do with a phase change in the the light based on its wavelength

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What devices use lasers?

There are a great many devices in the world that use lasers. Computer mice for example might use lasers to operate efficiently.


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Tape measures or laser range-finders would do that.


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Range finders work by emitting a laser beam towards a target and measuring the time it takes for the beam to bounce back. This technology, known as LIDAR (Light Detection and Ranging), allows range finders to accurately calculate distances by using the speed of light.


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Lazers do not exist. Lasers do, here is a short list of applications: bar code scanner, pointer, electric eyes, range finders, guidance systems, interferometers, high energy physics, medical/dental, optical disks (cds, dvd, blue ray), laser induced breakdown spectroscopy, matrix assisted laser desorption/ionization mass spectrometry, cutting devices... originally people wondered what the use of lasers could be, now the question is more of what can't a laser do.


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