What do you knowabout shadow? shine a torch at any object from different positians. As the positian of the torch changes, what do you notic about the positian and the length of the shadow formed?
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A shadow is a dark (real image) area where light from a light source is blocked by an opaque object. It occupies all of the three-dimensional volume behind an object with light in front of it. The cross section of a shadow is a two-dimensional silhouette, or a reverse projection of the object blocking the light.
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