optics - Does 'focal length' mean something different with lenses and pinhole cameras? - Physics Stack Exchange
How does a pinhole camera work? - The Handy Physics Answer Book
Pinhole Camera
Create a Pinhole Camera - Activity - TeachEngineering
Question 20 Using a pinhole camera a student observes the image of two of his friends, standing in sunlight, wearing yellow and red shirt respectively. What will be the colours of the
What is a Pinhole Camera, How Does a Pinhole Camera Work?