Advance Preparation and Setup

Make a copy of the Table of Object and Image Distance following this activity in the Teacher’s Edition. Darken the room as much as possible so students can see the images easily. If you use 110-V light bulbs, be sure there are no exposed wires. Use the kind of sockets that have the wiring connections inside a plastic or ceramic cover. If the socket is ceramic, then the connections are probably exposed underneath. Screw each ceramic socket down to a piece of wood, so the wiring is safely out of reach.