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Two boats go down the river on either side. What happens to the wake?What happens to the wake? Did you know that light waves ripple too?Did you know that light waves ripple too? We see the combined results of those ripples!We see the combined results of those ripples!

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Who figured this out? Robert Hooke first theorized that light moves in waves.Robert Hooke first theorized that light moves in waves. Christian Huygen expanded the theory to say that light waves leaving a source acted as tiny wavelets.Christian Huygen expanded the theory to say that light waves leaving a source acted as tiny wavelets.

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Superpostion The net displacement made by combining two wavs.The net displacement made by combining two wavs. Equals the algebraic sum of the displacement of each wave individually.Equals the algebraic sum of the displacement of each wave individually. Constructive Interference: Waves combine to make a larger wave.Constructive Interference: Waves combine to make a larger wave. Destructive Interference: Waves combine to make a smaller wave.Destructive Interference: Waves combine to make a smaller wave.

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Did you know that light can be bent around a corner? Diffraction Waves always bend or diffract when they pass by a barrier or through an opening.

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Let’s look at Young’s Two Slit Experiment.

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So, what does this mean mathematically? m is the number of lines away from centerm is the number of lines away from center Sin θ = mλ/ dSin θ = mλ/ d

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