When the customer just wants to use the star Laser Pointer

When the customer just wants to use the star Laser Pointer . 
Ordinary light is always divergence in all directions, as is necessary for the lighting. But to this light focused to a point, the vast majority of energy will be wasted, the efficiency is very low. The semiconductor laser light emitted vast majority are concentrated, it is easily launched into the fiber end. A long time, people light a variety of studies. Light in the end what is it? This problem has troubled many intelligent people in. The ancient Greek philosophers alone high-speed movement of the particle flow. All luminous objects like the sun, can issue such a stream of particles. When these tiny particles flow come into contact with the eyes, it caused people light feeling. During use of laser pointer , the customer should pay some attention to the maintenance of the laser pointer.
For the study of light after long years of no progress until the great Isaac Newton, only to create an optical study of the new century. Newton in his studio, with a prism, white light is decomposed into seven kinds of colored light from red to purple. This is the secret of human the first time I saw the light. White is not a single, but several different shade of composite. Further research so that Newton made his famous light particles: the light is made of high-speed motion of tiny particles; different shade of different particles, including the quality of the purple particles, the minimum quality of red particles. In this doctrine Newton to explain light refraction, reflection and the above-described dispersion phenomena. When using laser pointer , the customer should operate in the correct and suitable procedure.
Corpuscular theory in line with people's daily visual mental requirements. Just a straight line the road, it's easy to believe that just the stream of particles. Newton's immense popularity, the particles that moment to play the leading role. But also of Newton's contemporaries among vigorously refuted the corpuscular theory, the Dutch Huygens (1629 - 1695) in 1678 proposed the wave theory to explain the nature of light. He believes that the light particle theory can not explain the light cross through each other and independently of each other, but it is the basic nature of the wave. The wave theory of light is also very easy to explain the reflection and refraction phenomena of light. So in the end just wave or particle it? Here will introduce a special type of green star laser pointer with keychain.
The early nineteenth century and found that the optical interference, diffraction and polarization phenomena, such behavior is only suitable to explain the wave theory of light.