Laser
Lasers have found many uses in everyday life as well as in industry. Lasers are found in CD and DVD players, where they read the code from the disk that stores a song or movie. A laser is often used to read the bar codes or SQR codes on things sold in a store, to identify a product and give its price. Lasers are used in medicine, particularly in LASIK eye surgery, where the laser is used to repair the shape of the cornea. It is used in chemistry with spectroscopy to identify materials, to find out what kind of gases, solids or liquids something is made of. Stronger lasers can be used to cut metal.