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Thin Lenses Lab Report By: Luke Holder 4/20/20
Abstract: The objective of this experiment was to measure the focal lengths of both a thin convex lens and a thin concave lens. While measuring the focal lengths we also observed the characteristics of each lens. The primary equipment used in this experiment includes a bi-convex lens, a bi-concave lens, and a cross-haired light source. The primary results show the focal length of the positive convex lens to be around 14 cm, while the negative diverting lens had a focal point around -133 cm. Uncertainty was calculated for the positive lens and could be due to a faulty lens or lighting source. Results: Positive Lens: Trial Number Object Distance Image Location Image Distance Size of Image Focal Length 1 165 cm 180 cm 15 cm 1 cm 15 cm 2 105 cm 121 cm 16 cm 1.5 cm 13.9 cm 3 90 cm 106.1 cm 16.1 cm 1.9 cm 13.7 cm 4 60 cm 78 cm 18 cm 3 cm 13.9 cm 5 22.5 cm 58 cm 35.5 cm 15.9 cm 13.8 cm 6 28 cm 55 cm 27 cm 10 cm 13.8 cm Favg: (13.9+13.7+13.9+13.8+13.8)/5 = 13.8 cm Uncertainty: (13.9-13.7)/2 = 0.1 cm

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