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Wave Optics

Huygens principle

  • Every point on a given wave front (called the primary wave front) acts as a fresh source of new disturbances, called secondary wavelets.

  • The surface touching these secondary wavelets tangentially in the forward direction at any instant, gives the new wave front at that instant. This is called secondary wave front.

  • Using Huygen's principle we can prove the laws of reflection and and laws of refraction.

Doppler's effect of Light 

  • Change in frequency of light when there is relative motion between the source of light and the observer.

  • The fractional change in the frequency is found by νν= -vradc
     where vrad  is radial velocity that is relative velocity of source with respect to the observer along the line …

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