Determining The Lens Aberations on Positive Lenses Through Science Process Skill

Abstract

Abstract This research aims to determine aberrations or image distortions in a positive lens using an optics experiment kit for image distortions. The experimental tool consists of a diaphragm, a positive lens, a light source, lens path, an image capture screen, and a flint glass used to reduce lens distortions. The main tool is made of acrylic, which is durable and easy to use. The lens used is a strong positive lens (+100). The diaphragms used vary, including a slit diaphragm with five slits and a four-ring diaphragm. These diaphragms are used to produce image shapes and observe the distortions that occur. The work process refers to the skills of scientific processes such as observation, classification, measurement, prediction, communication, and conclusion, which are implemented in the work instructions for creating aberrations or image distortions by placing the positive lens parallel to the light source and the image capture screen. Then, the distortions that occur are observed, and a flint glass is placed in front of the light source to reduce the distortions that are formed. By observing the resulting image, it can be seen that the distortions that occur on the positive lens and how the flint glass works to reduce these aberrations. This is in line with the theory that aberrations on a positive lens occur due to imperfect light bias, either because of the different refractive index biases from different media in the lens, or because of the lens shape not being ideal. Flint glass is one of the methods used to reduce these aberrations.