O1-04: IMAGE INVERSION ON RETINA - INDIVIDUAL VIEWING

Hand out small squares of black paper with pins to the class members to do this experiment.

Punch a pinhole in the paper and hold the paper about an inch from your eye (within the near point of the eye) while viewing a white surface through the pinhole. Raise the pinhead from below into the line of sight between the pinhole and your eye. Because the "image" is actually a shadow on the retina, it is not inverted by the eyelens, and appears to be coming from above.