How shadows form
Move the lamp and the object to observe the rays and the shadow on the wall.
Move the lamp ☀ and the purple object. Rays travel in a straight line: the object blocks the light, which forms a shadow on the wall.
Object height
5.0 cm
Shadow height
10.7 cm
Lamp-to-object distance
14 cm
Object-to-wall distance
16 cm
Try this: what happens when you move the lamp closer to the object? When you move the object closer to the wall? When you make the object bigger?