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Young’s Experiment. Ripples. Wave on the surface of water have both constructive and destructive interference. Gaps where the ripples cross are from the destructive interference. From two point sources there is a pattern of constructive and destructive interference.
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Ripples • Wave on the surface of water have both constructive and destructive interference. • Gaps where the ripples cross are from the destructive interference.
From two point sources there is a pattern of constructive and destructive interference. Paths of destructive interference from nodes. Paths of constructive interference form antinodes. Two Sources
A slit in a barrier converts a plane wave into a point source. A double slit creates two point sources. Lines of nodes and antinodes Double Slit
Young’s Experiment • Young’s experiment of 1801 demonstrated the wave nature of light.
Constructive interference occurs when the path is shifted by a whole number of wavelengths. m is the order of the maximum Destructive interference occurs in between maxima. Right Triangle
The complete pattern from a double slit includes bright and dark bands. Central maximum at m = 0 First minimum at m = ½ Interference Pattern
The separation of first minima depends on the geometry and wavelength. Distance to screen D Separation on screen Dx Other maxima and minima separations can be found by extending Dm. Screen Shots next