# Lab1 - Wednesday Demonstration Lab 1 Part B Brewster's...

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Wednesday Demonstration Lab 1 Part B - Brewster's Angle Angle (degrees): 56 Part D - Divergence Diameter of Diameter of Distance from Telescoped (mm) Normal (mm) Aperture (m) 6 1 0 7 2 1 7 5 2 8 6 3 8 10 4 8 12 5 8 16 6 9 18 7 12 22 8 Spot Size on Wall (mm) Aperture Size (mm) 25 1 27 0.5 48 0.25 70 0.167

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The purpose of this experiment was to demonstrate the different properties of light. First, polarization was shown. A laser beam passed through two polariods, one fixed, and the other rotated about an axis parallel to the floor. The second polaroid was rotated until no light passed through, this showed that two polariods were aligned perpendicularly. A third polaroid was added to demonstrate that light could still pass through even though the other polariods were perpendicular. Brewster’s angle, an angle such that when light is incident on a surface at said angle, the reflected light is all polarized in the same direction, was calculated for a piece of glass. Brewster’s angle was demonstrated by shining the laser beam through a polaroid and onto the glass. The glass was then rotated until no light was reflected. Diffraction and interference were shown by shining the laser through a diffraction gradient until a diffraction pattern was seen on the screen. The diffraction patterns for two different wavelengths of light were compared using this method.
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