E403: REFRACTION FROM A SPHERICAL SURFACE: THIN LENS
Analysis
This experiment deals with producing and projecting images using the two kinds of lenses: Diverging and Converging Lenses. The properties of the converging lens or convex lens is the focus for this experiment. On the first part, the result shows that having an object at infinity, the image distance is equal to its focal length in either of the two lenses. As the image distance to the lens increases, its focal length also increases therefore the relationship between the two is directly proportional. The result concludes less than 5% percent error. The second part aims to determine the focal length of the lenses by having an object at finite distance which the distance ranging from…show more content… Lenses which is a transparent material have an ability to refract a parallel ray of light and can produce an image. Lenses can be classified as converging lens which has a thicker middle part of lens and a diverging lens has a thinner middle part. For this experiment, a converging lens was used with a different focal length, 10 cm and 20 cm. The focal length can be determined by using the thin lens equation where the object distance and image distance is related. The focal length of lens having the object at infinity will be equal to the image distance since the object distance is cancelled for it is infinity. Since the object distance and image distance is related to the thin lens equation, the object at finite needed the two distances to determine the focal length of the lens used. This is applicable for both converging and diverging lens. On the other hand, using a graphical method, the reciprocal of the image and object distance would be the plotted points to determine the x and y intercepts then the average of the reciprocals of the x and y intercepts would be the focal length of the lens. Furthermore, magnification of a lens can be the ratio of image height or can be the ratio of the image and object distance. The sign convention of the converging lens is positive for the focal length, the same with the object and image distance thus having a real object and real image. For the magnification, if the value for magnification is greater than one therefore the image produce is