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Measurement of focal length of lenses Procedure A. Measurement of focal length of convex lens 3. Measure the object distance (u) and the image distance (v). Repeat with the other values of u and locate the new positions of the images. Tabulate the results in the table below. u /cm 20.0 22.0 24.0 26.0 28.0 30.0 v /cm 20.0 18.2 17.0 16.2 15.5 15.2 1/u /cm?1 0.050 0.045 0.042 0.038 0.036 0.033 1/v /cm?1 0.050 0.055 0.059 0.062 0.065 0.066 B. Measurement of focal length of concave lens by using concave mirror 5. Measure the distance (r) of the pin from the mirror. r = ______30_________cm 7. Adjust the distance (d) between the concave lens and the concave mirror to about 10 cm. Then move the pin until there is no parallax between the pin and its image in the mirror and the lens. Measure the distance (v) of the pin from the concave lens. Repeat with the other d values. Tabulate the results in the table below. d / cm 10.0 12.0 14.0 16.0 18.0 20.0 v / cm 55.0 44.0 33.5 26.0 20.0 15.0 u = r ? d / cm 20.0 18.0 16.0 14.0 12.0 10.0 1/v / cm?1 0.050 0.056 0.063 0.071 0.083 0.100 1/u / cm?1 0.018 0.023 0.030 0.038 0.050 0.067 Results and Discussion 1. Using the results in...

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