Light is a form of energy that causes sensation of vision. When the light falls on a polished or shiny surface it gets reflected back into same medium. We see the things around us when reflected light from the object enters our eyes. Reflection of light takes place in accordance with the two laws of reflection. The incident light, reflected light and the normal at the point of incidence, all lie in same plane. Angle of incidence is always equal to angle of reflection. When light rays coming from an object incidents on a plane mirror, the image formed is laterally inverted i.e., left side of the object appears as right side in the mirror and vice-versa and the phenomenon is called lateral inversion. On the basis of surface of reflection, reflection is classified as regular reflection and diffused reflection. When an object is placed between two mirrors kept at an angle to one another, multiple images are formed and the phenomenon is known as multiple reflections. The phenomenon of multiple reflections is used in periscope and kaleidoscope. Dispersion of light is the phenomenon in which a white light beam when incident on a prism gets split into seven colours. Rainbow is formed due to dispersion of light. Human eyes have roughly spherical shape and are made up of living cells. The different components of eye work together to form an image of the objects we see. When one or more components constituting our eye do not work properly, certain eye defects arise. The defects of human eye can be corrected by using suitable corrective lenses. For visually challenged people, there is an important and powerful system which enables them to identify objects by touching the objects called Braille system.

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