This is a simulation of the superposition of two transverse waves travelling in opposite directions in the same medium. The magenta wave at the bottom is the sum of the red and blue waves. Use the sliders to adjust the wave speed, the amplitude of each wave, and the wavelength of each wave. Step through the animation with the Step Animation button or press the animation button in the lower left corner to run the animation. Use the check boxes to show opt hide the grid, as well as change the direction of the red wave.