Laser/ device/ concentrate/ light waves/ intense/ beam/ Thiết bị tia laser ...Đoạn văn59/60Laser/ device/ concentrate/ light waves/ intense/ beam/Laser is a device to concentrate light waves into an intense light beam. The laser is a device concentrating light waves on an intense light beam. The laser is a device which concentrates light waves into an intense light beam.A laser is a device which concentrates light waves to an intense light beam.Giải thíchĐáp án đúng là c.