The principle of notebook laser pointer

Laser, depending on wavelength, power, exposure time, spot size and positioning, can cause permanent damage to the eyes and retina, leading to blindness. When using slides, please use some of your notebooks or some organizers provided by the meeting organizer. In the latter case, there are several disadvantages: 1. The organization uses your presentation as a file, and you can do the operations required to record, and 2. The organization's computer may not have all the necessary software installed. The demo software may not be updated to the latest version. Video data may be particularly problematic: your video runs on your laptop, not on your organization’s computer (which happened to me a month ago). Video projectors are now very smart and can be used with Windows and Apple laptops or laptops. The retina is the part of the eye that is at significant risk because the laser passes through the transparent lens part of the eye and burns the nerve-covered part of the retina. Most laser pointers emit a strong light only when you press and hold the button. However, some models have a "constant on" setting. These are becoming more and more popular as pointing aids for telescopes. Once the laser is installed and aligned with the scope, just move the scope around until it shows stars on your target, and when you look at the eyepiece, it is there. Among all available lasers, the green laser is most noticeable in the dark because the naked eye is most sensitive to green. If the laser is aimed at the corner of the glass, even a 5 mW green laser pointer can cause temporary damage and damage to the retina.