6B10.10
Set up the grid board and an optical rail so that when the black square is at the far end of the rail, its shadow covers one 4x4-cm square on the board. Each time the distance between the square and the light source reduces in half, the shadow increases to four times the area.
Optical Rail
2 Sliding Carriages
1-in Square Barrier
Optical Cable Lamp
Chalkboard Grid
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