Laser pointers-useful or dangerous?
50mW green laser pointers are used in many different areas. Firstly these pointers are used in presentations to point out something important to grab the attention of the audience to look at a specific image or information that is being viewed. The device is also known as the astronomy green laser pointer as you can point out at the stars in the sky at night clearly. Be it night or day this high power laser pointer can point anything clearly at whatever it is. These lasers are made in different kinds of shapes which later are used to make key rings or other things.
Although 50mW laser pointer is used by many people all round the world but one caanot ignore its side effects. Its high radiations can cause permanent damage to the eyes. Therefore steps must be taken to avoid this danger at maximum levels. Once the laser pointer is beamed on, it calls for safety precautions. When a laser pointer is being used in a room, everyone in the room should be aware of the laser and should be told to take care of themselves. The high power green laser pointer should never be handed over to any kid or any person who is under any influence of a drug. Similarly, it should never be pointed directly to a person. The pointer should be strictly put away from any reflective material. If it reflects through a mirror and goes back at someone’s eyes, he may end up losing his sight. It is recommended to put on eyewear glasses. The device does not raise skin problems but still the lasers should not be exposed to skin for a long time.
The Hubble Telescope Pictures Space Through Time
It has been seventeen years since the launch of the Hubble Telescope. The cost to the United States and the European Union was originally projected at about 500 million dollars. The program’s costs are now estimated to be over 5 billion dollars. The Hubble’s costs were criticized prior to its launch and the early problems with the telescope’s imaging system further hurt the public’s initial perception of the project.