Thin Lenses - Thin Lenses Raelyn Pirtle February 21, 2008...

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Thin Lenses Raelyn Pirtle February 21, 2008 Physics 202 Lab
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Objective : The objective of this experiment is to study the basics of thin lenses. This is accomplished by using some of the laws of optics and calculating the focal lengths of one concave and two convex lenses. In part one of the experiment, each lens is used for various tests. They are tested as a magnifying glass, used to focus light, and used to focus an image. To see if the lenses would focus light, a light bulb was held up and the lens was used to focus a dot of light on a sheet of paper. To test the magnifying ability of each lens, they were simply held close to the eye. Finally, each lens was placed on the optical bench and taken into a dark hallway with a lighted room at the end. The lens or screen was moved until the image of the lighted room was focused on the screen. If the image was able to be focused, the distances were then recorded. Next, the focal length and magnification of the convex lenses was calculated using different measurements on the optical bench. Part two of the experiment uses the concave lens. The focal length and magnification of the concave lens was determined by using the two convex lenses along with the concave lens. Diagrams For part one: +100 mm S`=10.8 cm S= 20 meters
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+50 mm S`=5.7cm S=20 meters +100 mm and +50 mm (in general) S S` Data Part one: Focusing image in hallway Lens Object Distance (s) (cm) Image Distance (s’) (cm) 100 mm 2000 cm 10.8 cm 50 mm 2000 cm 5.7 cm (The concave lens did not focus an image.)
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Data for calculating focal length and magnification of the weaker convex lens Lens Object Distance (s) (cm) Image distance (s’) (cm) Object Size (h) (cm) Image Size (h’) (cm) 100 mm (small image on screen) 35.9 cm 15.4 cm 3.0 cm -1.4 cm 100 mm (big image on screen) 15.0 cm 36.3 cm 3.0 cm -7 cm 100 mm (chose screen to be at 80 cm) 12.4 cm 67.6 cm 3.0 cm -15.6 cm 100 mm (image height same as object height) 20.6 cm 22.9 cm 3.0 cm -3.0 cm Data for calculating the focal length and magnification of the stronger convex lens Lens Object Distance (s) (cm)
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Thin Lenses - Thin Lenses Raelyn Pirtle February 21, 2008...

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