But the house might still be able to tune into the radio station because the radio waves diffuse behind the mountain to the house. It is difficult to restrict these incoming waves propagating towards the coastal regions, therefore, the mathematical model can be constructed based on diffraction, refraction and partial reflection of incident wave to analyze the resonance phenomenon in the coastal regions such as harbor, bays, canals etc. Normally, radio waves would be blocked by the mountain. We might still hear the person talking, because the sound wave can diffuse through the bathroom doorway into the hallway, and then into my classroom.ġ7 Normally, radio waves would be blocked by the mountain The “receiver” is one of us in my classroom. Imagine the “source” to be a person talking in the bathroom. Refraction of waves involves a change in the direction of waves as they pass from one medium to another. Notice the water behind the wave barriers is still experiencing wave action.ġ6 Imagine the “source” to be a person talking in the bathroom Wave refraction involves waves breaking onto an irregularly shaped coastline, e.g. is the change in direction of a wave at such a boundary. The cooler, more humid air above the surface of the water refracts (bends) the sound wave away from the surface of the water, directing it more toward your ears, and the object producing the sound (like a distant boat or a duck) sounds like it is closer to you than it really is.ġ4 Diffraction- The bending of a wave around or behind an obstacle Light waves may change direction at the boundary between two transparent materials. You may have noticed that sound “carries” over calm water. The effect of this is that objects can sound like they are in a different position than they really are, or are closer or farther away than they really are. This image of the sky looks very much like water on the road.ġ3 Note that sound waves can also be refracted when they pass from hot to cold air, or from humid to dry air, or vice versa. Therefore, we see an image of the sky floating just slightly above the road, instead of seeing the road. Instead of reflecting off the road in a diffuse manner (and not producing an image of the sky on the surface of the road), the light from the sky refracts and gets to our eyes. (see pic next slide).Īs light from the sky gets closer to the ground, the hotter air above the road causes the light to refract before it hits the road surface. Presentation on theme: "Refraction and Diffraction of Waves"- Presentation transcript:Ģ Refraction- The change in direction of a wave as it is transmitted from one medium to another.ġ0 Mirages are due to refraction of light.
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