LectureQ2

# LectureQ2 - Chapter 2 Newton believed that light was made...

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3/28/2004 H133 Spring 2004 1 Chapter 2 Newton believed that light was made up of small particles. This point was debated by scientists for many years and it was not until the 1800’s when a series of experiments demonstrated wave nature of light. (But be patient we will see the particle nature of light in the next chapter.) There are a number of features that show us that light can behave like a wave. a) Interference from a double (or more) slits (We have seen interference in 1-D) b) Diffraction from a single slit. These are features of any 2 or 3 dimensional waves (light, water, sound, etc.) We will start with 2-slit interference ± Assumption : If the slit width is small enough, the two slits act approx. as point sources emitting circular waves. ( We will learn more about this with diffraction.)

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3/28/2004 H133 Spring 2004 2 Two Slit Interference Experimental Setup: Observations: ± Points where crests meet will give constructive interference. ± Points where crests and trough meet will give destructive interference. ( Note: This is based on the principle of superposition from Chapter 1. ) ± The constructive and destructive interference seems to fall along lines that radiate from a point midway between the slits. (At least at points far from the two slits.) Let’s derive an expression that gives the angle relative to the horizontal line. Parallel Waves Peaks overlap: Constructive Peak-Valley overlap: Destructive
3/28/2004 H133 Spring 2004 3 Two Slit Interference Consider each slit a point source

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## This note was uploaded on 06/03/2011 for the course H 133 taught by Professor Furnstahl during the Spring '11 term at Ohio State.

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LectureQ2 - Chapter 2 Newton believed that light was made...

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