# UF PHY 2054 - Mirrors and Lenses (30 pages)

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## Mirrors and Lenses

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Lecture Notes

- Pages:
- 30
- School:
- University of Florida-Gainesville
- Course:
- Phy 2054 - Physics 2

**Unformatted text preview: **

23 Mirrors and Lenses Clicker Questions Question P1 03 Description Reasoning with geometric optics and ray tracing Question An object is located on the optical axis and a distance of 8 cm from a thin converging lens having focal length 10 cm the image of the object is 1 2 3 4 5 6 7 real upright and smaller than the object real inverted and smaller than the object real inverted and larger than the object virtual upright and smaller than the object virtual inverted and larger than the object virtual upright and larger than the object None of the above Commentary Purpose To develop your ability to reason qualitatively with geometric optics Discussion You can plug the given values into the thin lens formulae for image position and magnification and if you use them correctly and know how to interpret the numbers you get you can answer this question However the question does not ask you to solve for the image location or magnification it merely asks for a qualitative answer For this a simple ray tracing diagram will suffice and is less prone to error Drawing the three principal rays from the source object through the lens you will see that they do not converge on the opposite side of the lens but spread apart as if they had originated at a point behind the source farther from the lens on the same side of the optical axis as the source point and farther from the lens axis than the source point So the image is virtual upright and larger than the source answer 6 Key Points Refrain from quantitative calculation when qualitative reasoning will suffice Graphical representations can be powerful tools for analyzing a situation and answering questions Know how to use the three principal rays to draw ray tracing diagrams For Instructors Only To help students appreciate the value of graphical representations for thinking and problem solving we must show them questions for which these tools are clearly superior to formula driven approaches Students should be encouraged to solve this

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