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Interference Patterns
Interference effects can be observed in all types of waves.  
The diagrams below represent two sets of waves, of identical frequency, produced by point sources which are oscillating in phase with each other.  
Patterns like these can be observed using small water waves (ripples) in a ripple tank.  
   
Waves from source 1   Waves from source 2
 
 
The next diagram shows the interference pattern produced by the two sets of waves.  
 
 
The next two diagrams show waves produced by sources of higher frequency.  
A higher frequency source produces shorter waves, as explained here.  
   
Waves from source 1 Waves from source 2
 
 
Interference pattern resulting from oscillations of higher frequency (and therefore shorter wavelength).  
 
   
Points where constructive interference occurs are called nodes or nodal points.  
Points where destructive interference occurs are called anti-nodes or anti-nodal points.  
Lines connecting consecutive nodes are called nodal lines.  
   
The three diagrams below show the approximate positions of nodes and anti-nodes with decreasing wavelength.  
The first diagram also shows some nodal (red) and anti-nodal (blue) lines.  
   
 
 
See here for similar diagrams representing interference patterns produced by red and blue light.  
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