LectureQ2

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

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
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.)
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
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
Background image of page 2
3/28/2004 H133 Spring 2004 3 Two Slit Interference Consider each slit a point source
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 11

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

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online