Introduction

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Light (Thin Lenses)

Learning Outcomes:

1) Describe the action of a (both converging and diverging) thin lens on a beam of light. 2) Define the term focal length for a converging lens 3) Draw ray diagrams to illustrate the formation of real and virtual images of an object by a thin converging lens.

Pedagogical approaches: - Concept cartoons (a) A scenario of someone dropping a converging lens onto the floor and it broke. An individual commented that no images can be formed. Another commented that the image may be smaller. One thought that the image is dimmer. (b) A scenario of someone thinking about what the image behind a translucent screen would look like. Some may think that it is laterally inverted just like a mirror. [|Refraction of light in prism applet] [|Composition of toner powder] Technology: