Question

which are uses of lasers? check all that apply. scanning barcodes transmitting telephone and internet signals examining internal body parts cutting through metals, ceramics, plastics, and cloth correcting vision problems

Explanation:

• Scanning barcodes: Laser scanners are commonly used in retail to scan barcodes. The laser light reflects off the barcode, and the pattern of reflections is decoded to identify the product.
• Transmitting telephone and Internet signals: Fiber - optic cables use lasers to transmit data over long distances. The laser light can carry a large amount of information (telephone calls, Internet data etc.) through the optical fibers.
• Examining internal body parts: In medicine, lasers can be used in endoscopy (e.g., laser - based imaging techniques) to examine internal body parts. For example, some laser - based microscopes or imaging devices can provide detailed views of tissues inside the body.
• Cutting through metals, ceramics, plastics, and cloth: Industrial lasers have high energy density. They can be focused to a very small spot, generating enough heat to melt or vaporize materials like metals, ceramics, plastics, and cloth, allowing for precise cutting.
• Correcting vision problems: In refractive surgery (e.g., LASIK), lasers are used to reshape the cornea. By precisely removing small amounts of corneal tissue, the laser can correct myopia (nearsightedness), hyperopia (farsightedness), and astigmatism.

Answer:

All of the options (scanning barcodes, transmitting telephone and Internet signals, examining internal body parts, cutting through metals, ceramics, plastics, and cloth, correcting vision problems) are uses of lasers.