Biomedical Engineering Reference
In-Depth Information
2.5
Diamond
2.4
1.7
Silicate flint glass
1.6
Borate flint glass
Quartz
Silicate crown glass
1.5
Fused quartz
1.4
Water
400
500
600
700
Wavelength (nm)
FIGuRE 1.2
Dispersion.curves.for.various.transparent.materials.
FIGuRE 1.3
A.glass.prism.separates.light.into.its.constituent.colors.because.of.the.dispersion.of.the.glass.
λ avg
Δ x
FIGuRE 1.4
Wave.packet.
Figure.1.4..If.Δ x .is.large.compared.to.a.wavelength,.then.the.wave.packet.can.be.composed.of.waves.
within.a.narrow.range.of.wavenumbers. k .around.a.mean.wavenumber. k 0 ..he.waveform.can.then.be.
expressed.as
E x t
( , )
=
E
e
i
(
ω
( )
k t kx
)
d
k
k
.
=
e
i
(
ω
t k x
)
E
e
i
(
∆ −
ω
t
kx
) d
k
0
0
k
 
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