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What are waves?
Particles that transfer energy from one place to another
Standing waves
-maximum displacement greater than progressive waves
- doesn't move at all at some points
- fixed at some points and maximum displacement at other points
-formed by two progressive waves going in two different directions with the same wavelength and frequency.
Graded index
- signals follow curved path
-gradual change in refractive index
-follow same path
-signals arrive at same time
-follow longer paths travel faster
-lower refractive index- cladding signals travel faster.
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