Wave Optics
Huygens principle
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Every point on a given wave front (called the primary wave front) acts as a fresh source of new disturbances, called secondary wavelets.
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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.
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Using Huygen's principle we can prove the laws of reflection and and laws of refraction.
Doppler's effect of Light
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Change in frequency of light when there is relative motion between the source of light and the observer.
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The fractional change in the frequency is found by
where vrad is radial velocity that is relative velocity of source with respect to the observer along the line …
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