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Huygens' principle, electromagnetic theory of light - Coggle Diagram
Huygens' principle
a light source in a homogeneous isotropic medium sends out light waves in every direction and these waves travel with equal velocity to carry energy with them to be transmitted in all directions.
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v=√E/p
v= wave velocity ,E=medium of elasticity, p= density
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summery :check:
- the secondary wavelets(spherical) from each point spread out in all directions with the velocity of light. :check:
- every point on a given wavefront may be regarded as the source of a new disturbance, called secondary wavelets. :check:
- the envelop of these wavelets in the forward direction at any instant constitutes the new wavefront at the instant. :check:
- why does not a wavefront propagate backward?
2.what is the justification of ignoring arbitrarily the large part of the secondary waves not tangent to the enveloping surface?
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