1. Introduction


Each and every days of our life is started by seeing the light. We can see everything in this world because of light. Light is a bright form of energy given off by something that makes it possible to see. Light is a form of energy that enables us to see all the things around us. When a light falls on an object, some of the light gets reflected back to our eyes. Thus we are able to see an object because of light being reflected from the object.
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The main source of light on the Earth is the Sun. Plants are able to prepare their own food during a process called photosynthesis by using sunlight. The potential for light to perform work is called light energy. Light energy is the only form of energy that we can actually see directly. It formed through chemical or radiation or mechanical means. Light energy can also be converted into other forms of energy.

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