Lab 10 Interference &amp; Polarization - JiaZheng 111381607 Lab 10 Interference Polarization The purpose of this laboratory is to understand the

# Lab 10 Interference & Polarization - JiaZheng 111381607...

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JiaZheng 111381607 Lab 10 Interferenc e & Polarization The purpose of this laboratory is to understand the phenomena of both Polarization and interference. In part I, we will qualitatively look at the interference pattern of a diffraction grating. We will also attempt to explain the observations that were made based on the various types of slit arrangements. The slits employed in this lab include, single slit, double slit as well as multiple slit to observe the central diffraction maximum. In Part II, we will observe diffraction by a human hair, and use it to measure the width of that hair. This effect will be similar to the diffraction shown on a narrow slit. We will be able to calculate the hair diameter from the observed diffraction pattern. We will then compare such a value with the actual diameter of the strand of hair which is done by employing the usage of a screw micrometer. In part III, we will look at the behavior of linearly polarized light. Producer: 1. The lab materials include 1 Helium-Neon Laser (632.8nm),1 Micrometer (small-distance-measuring device),1 Frame (+ tape), Hair, Movable wall, 2 Laser Pointers, Wave Optics Slides:2 Diffraction Gratings (500 lines/mm, 1000 lines/mm) ["rainbow" version], 3 Polarizers, Cornell slides (a few per room) & lamp 2. We Hold the 500 lines/mm diffraction grating up to the eye, and look through it at the red LED. 3. We see the LED in the center - as we look off to the left and right - horizontal red lines, which are the "diffracted" images of the LED. 4. Finally, we turn on the laser. Put the "movable wall" a short distance (~10-20

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cm) away, and point the laser at it. Put either diffraction grating in front of the laser. You should see the diffraction of the beam nice and clear - a few
• Fall '08
• Gurvitch,M
• Diffraction, Diffraction grating, polarizers

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