Difraccion Y Polarizacion

Páginas: 14 (3336 palabras) Publicado: 23 de octubre de 2012
EXPERIMENT #7

A. LIGHT INTENSITY IN DOUBLE-SLIT AND SINGLE SLIT DIFFRACTION PATTERNS
B. POLARIZATION: LEY DE MALUS

FISI 3014 SECTION ________

DATE OF EXPERIMENT: _______________

DATE DUE: _______________

DATE HANDED IN: _______________


COORDINATOR: ______________________________

GROUP MEMBERS:

______________________________

____________________________________________________________








Prepared and revised by: Prof. Haydee Pérez-Kraft
June 2008

Activity A: Light Intensity in Double-Slit and Single-Slit Diffraction Patterns


|Equipment Needed |Qty |Equipment Needed |Qty |
|Light Sensor (CI-6504A) |1|Diode Laser (OS-8525) |1 |
|Rotary Motion Sensor (CI-6538) |1 |Linear Translator (OS-8535) |1 |
|Aperture Bracket (OS-8534) |1 |Slit Accessory (OS-8523) |1 |
|Basic Optics System (OS-8515)|1 | | |


What Do You Think?


The wave nature of light can be investigated by studying diffraction patterns. What is diffraction and just how can the observance of diffraction patterns be used to verify the wave nature of light?

Take time to answer the ‘What Do You Think?’ question(s) inthe Lab Report section.

Background: Part One


In 1801, Thomas Young obtained convincing evidence of the wave nature of light. Light from a single source falls on a slide containing two closely spaced slits. If light consists of tiny particles (or “corpuscles” as described by Isaac Newton), we might expect to see two bright lines on a screen placed behind the slits. Young observed a seriesof bright lines. Young was able to explain this result as a wave interference phenomenon. Because of diffraction, the waves leaving the two small slits spread out from the edges of the slits. This is equivalent to the interference pattern of ripples produced when two rocks are thrown into a pond.

In general, the distance between slits is very small compared to the distance from the slits to thescreen where the diffraction pattern is observed. The rays from the edges of the slits are essentially parallel. Constructive interference will occur on the screen when the extra distance that rays from one slit travel is a whole number of wavelengths in difference from the distance that rays from the other slit travel. Destructive interference occurs when the distance difference is a wholenumber of half-wavelengths.

For two slits, there should be several bright points (or “maxima”) of constructive interference on either side of a line that is perpendicular to the point directly between the two slits.

Background: Part Two


The interference pattern created when monochromatic light passes through a single slit is similar to the pattern created by a double slit, but the centralmaximum is measurably brighter than the maxima on either side of the pattern. Compared to the double-slit pattern, most of the light intensity is in the central maximum and very little is in the rest of the pattern.

The smaller the width of the slit, the more intense the central diffraction maximum.






|SAFETY REMINDER|[pic] |
|Follow all safety instructions. | |






For You To Do


In Part A of this activity, use the Light Sensor to measure the intensity of the maxima in a double-slit diffraction pattern created by monochromatic laser light...
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