Numerical approximation of diffraction pattern from a slit of width equal to five times the wavelength of an incident plane wave in 3D visualization Numerical approximation of diffraction pattern from a slit of width equal to wavelength of an incident plane wave in 3D visualization Demonstrating reflection and focusing of mirrors īy placing a metal bar in the tank and tapping the wooden bar a pulse of three or four ripples can be sent towards the metal bar. Waves that are short in respect to the size of an object will cast a shadow behind the object. Reflection Waves that are long relative to the size of an object will wrap around the object. These include plane waves, reflection, refraction, interference and diffraction. As the axle rotates the motor wobbles, shaking the wood and generating ripples.Ī number of wave properties can be demonstrated with a ripple tank. Screwed to wood is a motor that has an off centre weight attached to the axle. Ripples may be generated by a piece of wood that is suspended above the tank on elastic bands so that it is just touching the surface. All the basic properties of waves, including reflection, refraction, interference and diffraction, can be demonstrated. The ripples on the water show up as shadows on the screen underneath the tank. Some small ripple tanks fit onto the top of an overhead projector, i.e. The ripple tank is usually illuminated from above, so that the light shines through the water. In physics, a ripple tank is a shallow glass tank of water used to demonstrate the basic properties of waves.
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