Nature of Light


 
 
Concept Explanation
 

Nature of Light

Light is an important form of energy that enables us to see the things around us. It produces the sensation of vision on our eyes. When light from an object enters our eyes, we see the object. This light can be that emitted by the object, as in the case of an electric bulb or a red-hot iron nail. It can also be the light bouncing off an object like a book. The branch of physics which deals with nature, source,properties and the effects of light is called optics.

What is the nature of light: Light has dual nature i.e, it behaves like a wave as well as  particle.Its wave nature help us to understand   how light bends around an object. It's particle nature  called as photon explains how light travels in a straight line. Photon is a particle that has energy and movement , but does not have mass or electrical charge.

Light is an electromagnetic radiation i.e it has both electical and magnetic field components perpendicular to each other as well as to the direction of propagation of light wave.

Some Properties of Light :  Light does not need a material medium to travel, i.e., it can travel through a vacuum too. The best example of this is light travelling from the sun to the earth across vast expanses of space that have no material (or matter). Compare this with sound, which is also a wave. Sound needs a material medium to travel. The speed of light waves depends on the medium through which it passes.

  • Light waves travel at a tremendous speed, whose value scientists have fixed at 299,792,458 rn/s which is nearly large 3times 10^8 m/sec 
  • According to current scientific theories, no material particle can travel at a speed greater than that of light.The light that enables us to see has a very small wavelength—less than ten thousandth part of a centimeter.
  • .... (More Text Available, Login?)
    Sample Questions
    (More Questions for each concept available in Login)
    Question : 1

    Light is essential for life on earth because _________________.

    Right Option : C
    View Explanation
    Explanation
    Question : 2

     Light from the sun reaches the earth in _____________________ .

    Right Option : A
    View Explanation
    Explanation
    Question : 3

    Which of the following are correct :

    (a) Light behaves like a wave as well as  particle.

    (b) Light is an electromagnetic radiation.

    Right Option : C
    View Explanation
    Explanation
     
    Video Link - Have a look !!!
     
    Language - Hindi/English
     
     
     
     
    Related Videos
    Language - Hindi/English
    Language - Hindi/English
    Language - Hindi/English

    Language - Hindi/English
    Language - Hindi/English
    Language - Hindi/English

    Language - Hindi/English
    Language - Hindi/English
    Language - Hindi/English

    Language - Hindi/English
    Language - Hindi/English

    Language - Hindi/English
    Language - Hindi/English

    Language - Hindi/English


    Students / Parents Reviews [20]