Thin Lenses

Topic Objectives

By the end of this topic, the learner should be able to:

1. Describe converging lenses and diverging lenses;
2. Describe using ray diagrams the principal focus, the optical centre and the focal length of a thin lens;
3. Determine experimentally the focal length of a converging lens;
4. Locate images formed by thin lenses using ray construction method;
5. Describe the characteristics of images formed by thin lenses;
6. Explain image formation in the human eye;
7. Describe the defects of vision in the human eye and how they can be corrected;
8. Describe the use of lenses in various optical devices;
9. Solve numerical problems involving the lens formula and the magnification formula.