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# Single Slit and Double Slit Diffraction

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Introduction

Single Slit and Double Slit Diffraction Objective To observe the diffraction patterns created by laser light passing through a single slit and double slit and to verify the equation which predicts the diffraction patterns in theory. Mathematical Theory n ? = d sin(?) n ? = d Procedure 1. Align a laser, a diffraction disk, and a light sensor mounted on a rotary motion sensor. 2. Allow the laser to pass through the diffraction disk. ...read more.

Middle

a 4x10-5 m wide slit Single slit diffraction pattern with a 8x10-5 m wide slit Double slit diffraction pattern with a 4x10-5 m wide slit and 2.5x10-4 m between slits Double slit diffraction pattern with a 4x10-5 m wide slit and 5.0x10-4 m between slits Double slit diffraction pattern with a 8x10-5 m wide slit and 2.5x10-4 m between slits Data Analysis By observing the characteristics of the diffraction patterns produced, one can see the difference between the single slit diffraction patterns and double slit diffraction patterns. ...read more.

Conclusion

The double slit diffraction patterns are more complex than those of produced by single slit diffraction patterns. Evaluation Although the general shapes of the expected diffraction pattern can be seen in all cases, there are many instances of minor aberrations in the graphs. These can be attributed to many factors; exposure to external light, misaligned equipment or human errors when manually sliding the light sensor. Conclusion All in all, the graphs seem consistent with the patterns predicted by theory. The expected diffraction pattern is clearly seen in all cases. Thus, the diffraction pattern predicted by theory was confirmed by this lab. ?? ?? ?? ?? Physics IBH-2 Mr. Butler Joseph Florendo November 22, 2001 ...read more.

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