Cambridge IGCSE Physics
3.2.3Thin lenses
Thin lenses in Cambridge IGCSE Physics: what the syllabus expects you to know, the learning objectives and how to practise.
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Learning objectives
What the syllabus expects you to be able to do.
- 3.2.3.1Describe how thin converging and diverging lenses act on a parallel beam of light.
- 3.2.3.2Define and use focal length, principal axis and principal focus (focal point).
- 3.2.3.3Draw and use ray diagrams for a real image formed by a converging lens.
- 3.2.3.4Describe an image as enlarged, same size or diminished; upright or inverted; real or virtual.
- 3.2.3.5Know that a virtual image is found by tracing diverging rays backwards and cannot be shown on a screen.
- 3.2.3.6Supplement: draw and use ray diagrams for a virtual image formed by a converging lens.
- 3.2.3.7Supplement: describe the use of a single lens as a magnifying glass.
- 3.2.3.8Supplement: describe how converging and diverging lenses correct long sight and short sight.
Lessons
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Thin lenses
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