Those sources of energy which are being produced continuously in nature and are inexhaustible, are called renewable source of energy. For example, wood is a renewable source of energy because if trees are cut from the forests for obtaining wood, than more trees will grow in the forest i…

The ability to see is called vision. It is also eyesight. Vision is known as 'drishti' in Hindu.  Sometimes the eye of a person cannot focus the image of an object on the retina properly. In such cases the vision of a person becomes blurred and he cannot see either the distant o…

Light Is a form of energy. Light is needed to see things around us. We are to able see the beautiful world around us because of light. We can read a book, see pictures in a marazine, and watch television and movies due to the existence of light. And it is light which makes us see our im…

There are advantage of having two eyes instead of one. Some of these are given below: 1. Having Two Eyes Gives a Wider Field of View. A human being has a horizontal field of view of about 150° with one eye open, the field of view becomes 180°. Thus, having two eyes gives a wider field o…

A normal eye can see the distant objects as well as the nearby objt clearly.We will now discuss how the eye is able to focus the objects lying at various distances. An eye 👀 focus the image of the distance objects as well as the nearby objects on its retina by changing the focal length…