Huygens’s wave theory of light. ! wave optics

wave optics

  Q. Explain Huygens’s wave theory of light.

      According to Huygens’s principal, each point in a source of light emits   waves in all directions in hypothetical medium ether. To explain the wave  theory of light Huygens proposed the concept of wavefront which is defined as an imaginary surface in the forward direction of light propagation at which all the points oscillates in the same phase. Shape of wavefront depends upon the shape of light source, based on this wavefronts are divided as ....

•  1. Spherical wavefront: If the source of light is a point source then the shape of wavefront       in such case will be spherical.
• 2. Cylindrical wavefront: If the source of light is a line source then the shape of wavefront      in such case will be cylindrical.
• 3. Plane wavefront: If the source of light is at very large distance then the shape of                    wavefront in such case will be plane.

                

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 Q. Explain the principle of superposition of light?

Ans: According to the principle of superposition when two or more than two waves are travelling in a medium then the resultant displacement of a particle of medium is the algebraic sum of  displacements produced by individual waves. For example if ‘n’ waves are travelling in a medium and each one of them produces displacement Y1, Y2, Y3, Y4,……Yn, 

then the resultant displacement of the particle will be given as: Y = Y1 + Y2 + Y3 + Y4 +…………..+ Yn

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