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igcse physics notesprinted 91 · PDF 91
124 pagesrevision 46936
printed 91 · PDF 91
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91
As shown in the above diagram, waves change their direction or “Refract”
due to change in density or change in a medium.
When waves move from Deep water to shallow water then Wavelength
decreases (refer to the diagram), but frequency remains the same. The
speed also changes due to change in medium and density so the waves
slow down.
When waves move from Shallow water to deep water then Wavelength
increases and speed increases so they bend away from normal. Frequency
is the same.
When Waves change medium but their direction of motion is perpendicular
to the surface then no refraction occurs. In all cases wavefronts are
perpendicular to direction of motion.