Pinhole Camera

Age 11 to 14 Challenge Level:
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?