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# Wave behaviors reg

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### Wave behaviors reg

1. 1. Wave propertiesWavefront – a line joiningpoints that are in phase - the lines you seewhen ripples spread onwater are wavefronts Rays – arrows drawn to show the direction of wave motion
2. 2. Reflection- The bouncing ofwaves off a surfaceRegular reflection –reflection from a smoothsurface - an image wouldappear to be coming frombehind the surface
3. 3. Diffuse reflection –reflection from a non-smooth surface - light bounces offthe surface but no imagecan be seenWhen light hits a surface, part of the wave is reflected,part is absorbed by the atoms of the material.When light hits a transparent material, some istransmitted through the window.
4. 4. Law of reflectionThe angle of incidence equals theangle of reflectionAll angles are measured to thenormal line (perpendicular to thesurface)
5. 5. RefractionWhen a wave passes from one medium intoanother, its velocity changes. If the wave hits theboundary at an angle, the wave also changesdirection.
6. 6. Light travels at 2 x 108 m/s in a substance. What is itsindex of refraction?The index of refraction of a liquid is 0.80. How fastdoes light travel in it?
7. 7. Snell’s Law
8. 8. A water wave travelling at 20 m/s enters a shallowregion where its velocity is 15 m/s. If the angle ofincidence of the water wave is 50o, what is theangle of refraction?35.2o
9. 9. Light travelling through air is incident on thesurface of a pool of water at an angle of 40o.Calculate the angle of refraction.