Additional Info

• ID Code: O1-04
• Purpose: Hand out small squares of black paper with pins to the class members to do this experiment.
• Description:

  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.

• Availability: Available
• References: REFERENCES: (PIRA 6J10.40) See Demonstration O1-03: IMAGE REVERSAL ON RETINA for a group demonstration of this effect.
• Loc codes: O1