Ch24_part1 - Chapter 24 part 1 PHY213 End of Semester...

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Chapter 24, part 1 PHY213 1 Chapter 24 Wave Optics Skip subsections: Newton’s Rings & Example 24.4, sec. 24.5, diff. grating in CD tracking, Optical Activity, Liquid Crystals. End of Semester information: Please complete course evaluations online (see syllabus). Worth 5 bonus points We’ll have one last Homework Set, which will be due Friday, August 31 st , not this Tuesday. Last Homework Quiz will be Monday, August 3 rd . We will cover most of Ch. 24, and selected topics (I’ll provide a detailed list Monday) from Ch. 27-29. Final Exam will be Thursday, August 6 th . You will have 2 hours, and may pick your start time (details later). Wave Optics s The wave nature of light is needed to explain various phenomena s Interference s Diffraction s Polarization s The particle nature of light was the basis for ray (geometric) optics Interference s Light waves interfere with each other much like mechanical waves do s All interference associated with light waves arises when the electromagnetic fields that constitute the individual waves combine…basically, vector addition
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Chapter 24, part 1 PHY213 2 Conditions for Interference s For sustained interference between two sources of light to be observed, there are two conditions which must be met s The waves must have identical wavelengths s The sources must be coherent s They must maintain a constant phase with respect to each other, which, for visible light (400-700nm) is no small feat. Producing Coherent Sources s Old school method s Light from a monochromatic source is allowed to pass through a narrow slit s The light from the single slit is allowed to fall on a screen containing two narrow slits s The first slit is needed to insure the light comes from a tiny region of the source which is coherent Producing Coherent Sources, cont s Currently, it is much more common to use a laser as a coherent source s The laser produces an intense, coherent, monochromatic beam over a width of several millimeters s The laser light can be used to illuminate multiple slits directly Young’s Double Slit Experiment s Thomas Young first demonstrated interference in light waves from two sources in 1801 s Light is incident on a screen with a narrow slit, S o s The light waves emerging from this slit arrive at a second screen that contains two narrow, parallel slits, S 1 and S 2
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Ch24_part1 - Chapter 24 part 1 PHY213 End of Semester...

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