huygen's principle of wave propagation · huygen's principle of wave propagation...
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Huygen's Principle of Wave Propagation
Wavefront: the leading surface of a wave disturbance
Huygens' Principle:
REFLECTION at a interface
HUYGENS - FRESNEL PRINCIPLE
Construction of wavefronts ( Isotropic materials) The figures present three cases for different the index of refraction of medium-2. The index of refraction is the same for medium-1 The incidence angle is the same in all the three cases. Notice the variation of the refracted angle.
Image
uB
A
D
C
Wavelet
Y
1
2
Wavefront
Ray
Image
u X
YB
A C
Wavelet D
1
2
Image
uX
YB
A C
Wavelet D
1
2
Wavefront
Ray
Glass
<
>
REFRACTION OF LIGHT Case: V2 > V1
Air
Wavelet
Wavefront
Ray
Case: V2 > V1
Ray
Wavefront
REFRACTION OF LIGHT Case: V2 < V1
Air
Glass
Wavelet
λ2
Ray
Ray