Physics Investigation: determine the focal length of a converging (convex) lens For example, convex lens focal length 10 cm Report headings Indicative content AO Title Investigation to determine the focal length of a converging lens Teacher led Objective To complete an experiment to find the focal length of a convex Teacher lens led Introduction Definitions of converging lens, focal length, and object and image A01 distance and lens equation Materials and Power supply, optical bench - lamp house with object, lens, AO1. Apparatus screen, meter rule and labelled diagram of set up AO2 Risk assessment Identification of risks and explanation of how to minimise risk, for A03 example: if the lamp is switched on for too long it becomes hot Procedure Line up using an optical bench or metre rule the lamp house, | AO2. lens and screen A03 Move screen until a clear image is obtained Measure object and image distance Repeat for different object distances Results Table of results with appropriate headings and units A02 Graph of reciprocal of object distance against reciprocal of image distance to find focal length Conclusion Focal length determined A03 Evaluation, limitations and sources of error in the experiment should be given