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

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.
O1

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