P219lecture21diffraction - Goal To understand diffraction...

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Goal: To understand diffraction Objectives: 1) To learn about the results of Young’s Double Slit Experiment 2) To understand when you get maxima and minima 3) To learn how to calculate where the maxima and minima are 4) To learn the Small angle approximation 5) To learn how the equations for multiple slits change when using only a Single Slit
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Young’s Double Slit Experiment In 1801 Thomas Young passed light through 2 parallel slits. Below would have been the result:
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Why? Light going through both slits spread out in all directions. On a screen at any point waves going through different slits travel different distances. The wavelength of light is pretty small, so even a small change in distance can have big effects. From wikipedia:
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So: Where the waves add in phase you get a bright area. Where they add out of phase you get a dark area. Conceptual question! If the wavelength of your light is 600 nm then what is the path length differences between the two slits for the first dark region?
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