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Pinhole Camera

Stage: 3 Challenge Level: Challenge Level:1
If you're having difficulty explaining your experimental results, try drawing a diagram, showing how the rays of light pass from the object through the pinhole to the screen.

Then look at the triangle formed by the height of the object and the rays of light going to the pinhole and the triangle formed by the rays of light beyond the pinhole and the height of the image on the screen.

What can you say about those triangles?
The NRICH Project aims to enrich the mathematical experiences of all learners. To support this aim, members of the NRICH team work in a wide range of capacities, including providing professional development for teachers wishing to embed rich mathematical tasks into everyday classroom practice. More information on many of our other activities can be found here.
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NRICH is part of the family of activities in the Millennium Mathematics Project.