5th Class Science Lights, Sound and Force Light

       Introduction

We all have eyes to see, but we can't see anything with these eyes in dark. It means to see objects we need light. Light is a form of energy that enables us to see. The Sun is the largest source of light. Distance between the stars is measured in light year. In this chapter, we will study about the characteristic features of light and sound.

     Light

A beam of white light has seven colours, which can be seen when a beam of white light is passed through a prism. When a beam of light strikes on the surface of prism, it splits into seven colours. The best example of these colour of white light is the formation of rainbow in the rain. An important property of light is that, it does not require medium to travel..