Formation of images - lab report PDF

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Experiment: Formation Of Images By A Converging Lens Name: Abdonnie “Abbey” Holder Physics 156 Section: 15768 Partner: May Myet Chel Professor: George Poppe Experiment Date: 11/29/2018 Due Date: 12/06/2018

Objective The objective is for experimenters to understand the transition of images by converging lenses. Measure the focal length of a converging lens. Measure the magnification of a converging lens using the formula. Determine if the Lens Equation is valid for the experiment. Lastly, experimenters are find and measure the lengths of the real and virtual distances. Principal Convex lens are special lens that are capable of finding the initial parallel light rays from one point upon which light passes through the lens. The point at which the light passes through is known as the focal point F. The length between the focal point and the focal distance f is called the lens’ center. The formula connecting all three distances do, di and f is known as the Lens Equation: 1/ 𝑑𝑑 + 1 /𝑑𝑑 = 1 /𝑑 . If the object is placed at a distance shorter than the focal length do < f. The image, both real and virtual, is of the same shape, yet, its size hi is different from the size of object ho. The ratio hi/ho = m is known as magnification of lens. There is a simple relation between the ratio di /do and magnification, m: 𝑑 = ℎ𝑑 /ℎ𝑑 = − 𝑑𝑑 /𝑑𝑑. Apparatus Vernier dynamics track Vernier light source Vernier 20cm converging lens Vernier Screen Small white Ruler LED

lamp

Results Overall there was little percent error in the overall calculations. There is an F Average = 20.215 cm

compared to the theoretical value of 20 cm for the F value. There was an 1/f Exp AVG= 0.168 cm-1. In addition there was a calculated percent error between M1 and M2 of 14.41%. Discussion Experimenters were successful in understanding the transition of images by converging lenses and determining the focal length of a converging lens. In addition experimenters were successful in measuring the lengths of the real and virtual distances all the while verifying the Lens Equation. Conclusion Overall, experimenters computed a successful experiment that resulted in very little percent error that was significant enough to cause create distortion in the experiment, however, the experimental error that was developed may have came about from systematic errors and personal errors. Theses error can be fine tuned by double checking that experimenters are conducting the experiment correctly in an orderly fashion.

Experimental Questions: 1. Could this experiment be constructed using a diverging lens? Explain you answer.

1. I believe we would not because as the virtual image on the same side of the lens approaches the lens then at the same time, the image becomes larger. However this is not seen for this experiment, thus it is not possible. b. Using the value of f you have obtained, draw a ray diagram, to scale, for the first set of values of do and di. Use three rays to construct the image. 1. This is below:

3. Predict the shortest distance between the source and screen when it is still possible to obtain sharp image. a. The shortest distance would be the focal length that is measured for each experiment, essentially, there is an infinite amount of possibilities.

Calculations Worksheet F Average = 20.215 cm

1. 22.73-2022.73*100=12.011% 2. 18.18-2018.18*100=10.011% 3. 22.22-2022.22*100=9.99% 4. 19.23-2019.23*100=4.04% 5. 22.22-2022.22*100=9.99% 6. 20.41-2020.41*100=2.01% 7. 21.73-2021.73*100=7.96% 8. 20.10-2020.10*100=1.54%

1. AVG M1= 7.045 2. AVG M2= 6.03 1. 7.045-6.037.045*100=14.41% ii.

1/f Exp AVG= 0.168 cm-1

A. 0.0440-0.050.0440*100=13.64% B. 0.0550-0.050.0550*100=9.09%

C. 0.0450-0.050.0450*100=11.11% D. 0.0520-0.050.0520*100=3.85%

E. 0.0450-0.050.0450*100=11.11% E. 0.0490-0.050.0490*100=2.04% E. 0.0460-0.050.0460*100=8.70% E. 0.04973-0.050.04973*100=1.51%...