According to Huygens principle of secondary wavelets, each particle at a wave front

  1. is an electron
  2. behaves as a photon
  3. behaves as a new light source
  4. represents the direction of the motion of wave front

Answer (Detailed Solution Below)

Option 3 : behaves as a new light source
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CONCEPT:

  • Wavefront: The locus of all particles in a mediumvibrating in the same phase is called waveFront.
  • The direction of propagation of light (ray of light) is perpendicular to the waveFront.
  • Every point on the given wavefront acts as a source of a new disturbance called secondary wavelets which travel in all directions with the velocity of light in the medium.
  • surface touching these secondary wavelets tangentially in the forward direction at any instant gives the new wavefront at that instant. This is called a secondary wavefront.

 

F2 P.Y 23.5.20 Pallavi D 5

EXPLANATION:

  • Huygens suggested that light may be a wave phenomenon produced by mechanical vibrations of an all-pervading homogeneous medium called ether just like those in solids and liquids. So each particle at a wavefront behaves as a new light source. So option 3 is correct.
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