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Astronomy Lab #2

# Astronomy Lab #2 - the large medium and small slits I was...

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George Voren Lab #3: Light is a Wave Report questions: A. 1.) The diffraction pattern was in the form of successive rings circling around each other outward until they were too light to see with the naked eye. The brightest part of the image was the circle in the center of the image. I was able to see 12 circle fringes with the large pinhole, 4 with the medium, and 1 with the small. 2.) The diameter of the medium sized pinhole is .520 mm and the small pinhole is .280 mm. Yes, the small pinhole looked to be about half the size of the medium sized pinhole. 3.) Yes, my results confirm that smaller apertures produce larger airy discs. It is obvious because the formula requires you to divide by the diameter of the airy disc, so the larger the diameter, the smaller the diameter of the pinhole since you have a lager number in the denominator. B. 1.) The diffraction pattern I saw was a solid bright circle with little slits successively getting smaller in height going towards each side laterally in a symmetric manner. For
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Unformatted text preview: the large, medium, and small slits I was able to see, 20, 15, and 5 bright fringes for each respectively. 2.) Check calculations sheet attached. Yes, my answers appear reasonable because the slits get smaller as the slits get larger. 3.) The overall pattern spread out to a parallel pattern for each slit. If the slits were turned 90 degrees, the slits would still be parallel but in a line from top to bottom. C 1.) 2.) d=0.4262 mm The answer does seem reasonable because the distance looked < 1mm. 3.) The orientation of the linear fringes are parallel to the line connecting the center of the pinholes. If the slide was rotated 90 degrees, then the circle-like image would still have the same outline but the slits would be horizontal instead of vertical. D 1.)Yellow was diffracted through the largest angle, and purple was diffracted through the smallest angle. This is in agreement with section 2 because the middle color is the brightest....
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