| Categories |
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| Mechanics |
| Fluid Mechanics |
| Oscillation and Waves |
| Thermodynamics |
| Electricity and Magnetism |
| Optics |
| Modern Physics |
| Astronomy |
| Images |
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[Setup Time: 5 Min.] [Current Condition: Good]
The flat plastic lens from the surface of an overhead projector can be used for comic effect when held directly in front of the speaker's face.
Lens in H. Optics, 1
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