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EXPERIMENT 5-2

# EXPERIMENT 5-2 - unclear 5 By moving the screen closer to...

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Anil Kanungo (ASK 358) Partners: Ramon Salazar, James Bloom PHY 115L 60675 October 13, 2008 Page 1 of 2 EXPERIMENT 5 – Thin Lens (Part II) [Experiment 4]: 1) When the laser was inside the focal length and we moved the laser down, the beam moved down as well. When the laser was outside the focal length and we moved it down, the beam moved up. 2) Movements near the edge of the lens caused the laser to divert from the focal point more than movements around the center. This would not occur in a parabolic lens. This is phenomena can be illustrated with in the diagram below: 3) We thought that placing cardboard over ½ the lens would make the image dimmer. When we tried it, we found that the image was in fact dimmer but only so on the opposite ½ of the image from what we were covering. 4) When a mask that had the inner radius blocked out was applied, the image was very hazy and

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Unformatted text preview: unclear. 5) By moving the screen closer to the lens, we were able to find a new position where the image was most focused. This can also be observed in the diagram above. 6) By using a mask that had the inner radius cut out, we found that the image became very clear and “filtered.” 7) We measured Σ LC = 46.5 cm and f = 48.5 cm for the planar side and The convex side measured Σ LC = 47.25 cm and f = 47.0 cm . 8) As the lens is “stopped down,” the position of Σ LC moved farther and farther from the lens. 9) The rays that entered from the “normal” or the “flat” side of the lens had less spherical aberration than the rays that entered from the curved side. 10) Where z = 2.5 cm and Δ = 0.319 cm Anil Kanungo (ASK 358) Partners: Ramon Salazar, James Bloom PHY 115L – 60675 October 13, 2008 Page 2 of 2 11)...
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EXPERIMENT 5-2 - unclear 5 By moving the screen closer to...

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