These lenses are arranged so that they pass images from one end of the table to the other.
Light
Have a friend sit down at the other end of this table and rest his/her chin on the chin rest. Flip all four lenses onto the track and position lens #1 at the arrow. Sit down in the chair, place your chin on the chin rest and look straight ahead. Can you see your friend's face right in front of you? Can your friend see your face?
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