1. A laser pointer is a focused point of a beam of light. Laser pointer is a visible laser designed to be portable, easy to hold by hand, laser module (diode) processed into a pen-shaped emitter.
2, UV lamps sunlight is scattered. Ultraviolet lamp is a device that emits ultraviolet light, is necessary to observe the fluorescent and phosphorescent characteristics of the sample, but also used for sterilization and disinfection of a physical means.