Wave · SHS3 Physics

Lesson notes

Learning Objectives

Indicator: 3.2.2.LI.1 - Identify the types and features of lenses.

By the end of the lesson, learners can:

Define a lens and distinguish between the two main types: concave (diverging) and convex (converging) lenses, citing at least one everyday example of each.
Identify and label the key features of a lens: pole, principal axis, optical centre, principal focus, and focal length, using a clearly drawn diagram.
Explain the relationship between the focal length, the principal focus, and the curvature of a lens, stating how these features determine whether a lens converges or diverges light.
Use ICT tools (internet, videos, or virtual labs) to research and share accurate information about lens features, presenting findings clearly to a peer group.
Classify a range of real-world optical devices (spectacles, magnifying glass, camera, projector) according to the type of lens they contain, with supporting reasoning.

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Curriculum details

Strand: Energy (Strand 2)
Sub-strand: Wave (2.2)
Content standard: 3.2.2.CS.1 - Demonstrate knowledge and understanding of lenses 3.2.2.LO.1 Use the working principles of lenses to explain the operation of some optical instruments.
Indicator: 3.2.2.LI.1 - Identify the types and features of lenses.
Suggested placement: Semester 1, Week 15 (Week 15 of the year)
Our suggestion, laid out in curriculum order across three terms of twelve weeks. NaCCA does not fix the week, so follow your school's scheme of learning.
Curriculum reference: NaCCA curriculum document, p. 167

Exemplars (from the NaCCA curriculum)

Collaborative learning: Using the internet/reference books, let learners research to find the meaning of the following terms concave lens, convex lens, pole, principal focus, principal/central axis, focal length, and optical centre before watching a video.
Encourage diverse perspectives and contributions.
Assessment (3.2.2.AS.1). The document marks these depth-of-knowledge levels for this indicator: Level 2 Skills of conceptual understanding; Level 3 Strategic reasoning.
Teaching and Learning Resources:
- Audio-visuals
- Internet
- Projectors
- YouTube
- Interactive
- Reference virtual laboratory books