Wavefront
Category : JEE Main & Advanced
(1) Suggested by Huygens
(2) The locus of all particles in a medium, vibrating in the same phase is called Wave Front (WF)
(3) The direction of propagation of light (ray of light) is perpendicular to the WF.
(4) Every point on the given wave front acts as a source of new disturbance called secondary wavelets which travel in all directions with the velocity of light in the medium.
(5) A 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
Different types of wavefront
| Type of wavefront | Intensity | Amplitude |
|
Spherical
|
\[I\propto \frac{1}{{{r}^{2}}}\] | \[A\propto \frac{1}{r}\] |
|
Cylindrical
|
\[I\propto \frac{1}{r}\] | \[A\propto \frac{1}{\sqrt{r}}\] |
|
Plane
|
\[I\propto {{r}^{0}}\] | \[A\propto {{r}^{0}}\] |
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