z14-DIFFRACTION WITH A LASER

# z14-DIFFRACTION WITH A LASER - DIFFRACTION WITH A LASER...

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46 DIFFRACTION WITH A LASER OBJECT Demonstrate diffraction using a laser and different slit configurations. APPARATUS Laser, optics bench, slit disks, screen, ruler THEORY Single slit diffraction pattern Light source b a c d θ Screen Zero Maximum 1st Minimum 1st Minimum 1st Maximum 1st Maximum 2cd Minimum 2cd Minimum θ R L Figure 1. Illustration of single slit diffraction. W is the slit width. The last several experiments have modeled light as a ray, or particle that can be reflected and refracted from a surface. In this experiment we will try to investigate the wave nature of light. We know that light is composed of electromagnetic radiation. The wave nature of light along with the Huygen's wavelet theory can explain interference patterns of light. When light from the light source strikes the slit, ab, each point on the slit acts as a wave source. The wave fronts from each point expand outward until they hit the screen. In the case of the illustration above light that left point b and reached point d has traveled farther than the light that has left point a and has traveled to point d. If the distance bd is greater then the distance ad by a full wavelength then the two waves are said to arrive at the point in-phase. We have seen

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## This note was uploaded on 08/25/2011 for the course PHYS 164 taught by Professor Johnjames during the Fall '09 term at MO St. Louis.

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z14-DIFFRACTION WITH A LASER - DIFFRACTION WITH A LASER...

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