Thin Lens Physics Exp
Experiment 9- Thin Lenses
Introduction
Experiment 9 introduced us to the concept of thin lenses. We were asked to determine the focal lengths of two converging lenses and one diverging lens. The following equations were used to calculate the focal lengths: 1/p + 1/q = 1/f where p is equal to the distance of the object from the lens and q is equal to the image length from the lens, and f is the focal point and 1/converging F+ 1/diverging F = 1/combined. The focal point is positive for converging lenses and negative for diverging lenses. Conclusion
The first portion of the experiment examined the images formed by diverging and converging lenses. For the short converging lens the focal length was determined to be about 5 cm and the image found when p > f the image was found to be smaller, inverted, and real. For the long converging lens the focal point was found to be about 30 cm. The image was smaller, inverted, and real when p > f. For the diverging lens, the focal length was determined to be about -2 cm and the image formed was smaller, virtual, and erect when p > f.
The second part of the experiment excelled the focal length of the lenses. We found that there are two positions where the short converging lens can form a sharp image. In one place the object was magnified and in the other it is diminished and the diverging lens will not form a real image. In this part of the experiment the converging lens was found to have a focal length of 5cm and its magnification values were found to be 5.4 cm and .19 cm. Some sources of error in this experiment could lie in the measurements taken. The measurements could be off to a certain degree especially in the first part of the experiment when using the lights and images off the soda machine. Another source of error could have come from the lab manual. The lab manual gave us the wrong distance for the second part of the experiment when trying to find the second images.
Sample Calculations
Introduction
Experiment 9 introduced us to the concept of thin lenses. We were asked to determine the focal lengths of two converging lenses and one diverging lens. The following equations were used to calculate the focal lengths: 1/p + 1/q = 1/f where p is equal to the distance of the object from the lens and q is equal to the image length from the lens, and f is the focal point and 1/converging F+ 1/diverging F = 1/combined. The focal point is positive for converging lenses and negative for diverging lenses. Conclusion
The first portion of the experiment examined the images formed by diverging and converging lenses. For the short converging lens the focal length was determined to be about 5 cm and the image found when p > f the image was found to be smaller, inverted, and real. For the long converging lens the focal point was found to be about 30 cm. The image was smaller, inverted, and real when p > f. For the diverging lens, the focal length was determined to be about -2 cm and the image formed was smaller, virtual, and erect when p > f.
The second part of the experiment excelled the focal length of the lenses. We found that there are two positions where the short converging lens can form a sharp image. In one place the object was magnified and in the other it is diminished and the diverging lens will not form a real image. In this part of the experiment the converging lens was found to have a focal length of 5cm and its magnification values were found to be 5.4 cm and .19 cm. Some sources of error in this experiment could lie in the measurements taken. The measurements could be off to a certain degree especially in the first part of the experiment when using the lights and images off the soda machine. Another source of error could have come from the lab manual. The lab manual gave us the wrong distance for the second part of the experiment when trying to find the second images.
Sample Calculations