A Comprehensive Guide to Home Security Systems:

 How do we humans perceive the things around us? We have five senses that help us to interact with the world around us. These are;

Sight Hearing Taste Smell Touch Eye helps us to see things. Ears Helps us to hear sounds.

 We smell with our nose taste, with our tongue and the sense of touch is provided by our skin. Of course all senses are important but the sense of sight is the most important. Here is an interesting fact we perceive almost 80% of the world around us by using our sense of sight.

We see objects around us with our eyes but then why don't our eyes see these objects in the dark. The answer to this question is light. We are able to see the objects around us because of the light coming from these objects. The light from these object travels in space and reaches our eyes. When it's dark or during night time, as there is no light. We are unable to see these objects clearly. Some objects can generate their own light for instance.The Sun, the fluorescent bulbs, burning candles, can generate their own light the objects which generate their own light are called the Luminous objects. Almost all of the objects that we come across cannot generate their own light. The table, a chair wallpaper are few, such example such objects are called as non luminous objects. But we just told you that we see objects around us because of the light coming from them and if objects like these cannot generate light, then how come we are able to see them? We are able to see them because of the reflection of light, these objects reflect the light to our eyes. What light are the reflecting? Where is the light coming from? This site is nothing but the light coming from the Luminous objects. So how can we summarize this. we are able to see non luminous objects because they reflect the light of the Luminous objects falling on these surfaces. Let me repeat the light coming from the Luminous objects falls on the non luminous objects. Non–luminous objects then reflect this light and this reflected light travels towards our eyes, and that's why we see the objects. In the daytime we are able to see blue skies, the white clouds and the green grass because the light from the sun is getting reflected by them and traveling towards our eyes. At night we are able to see the moon because it is reflecting the light from the sun. Note that moon is non luminous and it cannot generate its own light. As we said earlier, most of the objects that we come across in our daily life are non luminous. We only see them because they reflect the light. Step inside a dark room light up a torch and point it at the distant world. Look carefully at the path of the light coming from the torch, you will see tiny dust particles in the end.

What is the reason for this?  

Why are you able to see these particles? You are able to see the dust particles because the light from the torch is getting reflected from their surfaces and traveling towards our eyes. We also see the same thing in a very dimly lit room, but the only source of light is a small amount of sunlight coming from the window. We also saw that the reflection of light plays an important role. It's because of the reflection of light that we are able to see most of the objects.