Lab 7 wave optics in this lab you will solve problems

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LAB 7: WAVE OPTICS In this lab, you will solve problems in ways that take advantage of light interference, a phenomenon most easily understood in terms of the wave nature of light. Like waves, light can interfere constructively and destructively with itself. Under some conditions, this causes distinctive patterns of light and dark fringes that would not be seen if light had no wave-like behavior. These conditions may be less familiar to you than the conditions for which geometrical optics is useful. The results of interference can, however, be seen in common situations such as the colored fringes that form in parking lot puddles where a thin layer of oil floats on the water, or the colored light patterns that reflect from a compact disc. O BJECTIVES : After successfully completing this laboratory, you should be able to: Describe interference patterns in terms of constructive and destructive interference. Predict how changes in the size of an object or slit, or the wavelength of the light, will affect interference patterns. P REPARATION : Read Sternheim & Kane chapter 21 section 1-4 and chapter 23 sections 6, 7 & 9. Keep the objectives of the laboratory in mind as you read the text. It is likely that you will do these laboratory problems before your lecturer addresses this material; the purpose of this laboratory is to introduce you to the material. Before coming to lab you should be able to: Find unknown quantities using trigonometric relationships. Relate constructive and destructive interference of two waves to phase/path differences between the two waves. Describe why laser light is described as coherent. Create graphs of measured quantities and determine the equation describing linear relationships between graphed quantities. 177
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