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PY208N-Lecture-33 - Physics 208N-004 Lecture#33 11 April...

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1 The electric fields at the point P from the two slits are given by where . Physics 208N-004 Lecture #33 – 11 April 2011 Chapter 34: 5 Light Waves and Interference 34-4 Intensity in the Double-Slit Interference Pattern The time-averaged intensity is proportional to the square of the field:
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2 34-4 Intensity in the Double-Slit Interference Pattern This plot shows the intensity as a function of angle. Another way path lengths can differ, and waves interfere, is if they travel through different media. If there is a very thin film of material – a few wavelengths thick – light will reflect from both the bottom and the top of the layer, causing interference. This can be seen in soap bubbles and oil slicks. 34-5 Interference in Thin Films
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