Children’s Views on Light: What Is a Shadow?
Most 10-11 year-olds: Relationship is seen between shape of object and shape of shadow, but no explanation can be given for the cause.
Ninety percent of 10-11 year-olds can predict the position of a shadow relative to the position of the sun.
Many13-14 year-olds: Shadows are formed because light is blocked by an object.