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Lenses and Focal Length

Use a magnifying lens to form an image on a screen, measure its focal length, and test the lens equation.

Grade 9ExperimentScience OlympiadSciencePhysicsMeasurementData AnalysisIntermediate50 to 80 min5 materialsAdult supervision required

What you'll learn

  • Define focal length and find it from a distant object
  • Measure object and image distances
  • Verify 1/f = 1/u + 1/v and discuss errors

Objective

Measure the focal length of a converging lens and check that object and image distances follow the thin lens equation.

STEM concepts

RefractionConverging lensReal imagesThin lens equation
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Materials and safety
Step-by-step instructions
Prediction, test sheet and results
Why does it work, challenge and project report

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