We cannot imagine a world without light. Light lets us see. Light was first studied by Sir Isaac Newton. He said that light consisted of minute particles which are shot out from the source of light. Another theory was suggested by Huygens. He said that light is in a form of ‘wave’ or ‘pulse’. Light is a form of energy whose speed can be measured. We are familiar with many properties of light, for example, white light is a mixture of all colours. Theories also suggest that the colour of an object is due to the colour it reflects from the spectrum of white light. A green leaf is green because it absorbs all the colours except green.
What is Light?
