Planning for the Activity
Time Requirements:

• one and a half class periods

• 40-W Bulb and Socket, Ceramic w/Switch
• Ruler, Metric
• Acetate Sheet, 8 cm Square
• Bulb, Clear 100-w
• Lens, Convex Focal Point 10 cm
• Marker, Felt-Tip
• Overhead Projector
• File card with an arrow-shaped cutout
• Stick, Meter, 100 cm Hardwood
• Steel Scissors