A shadow is a dark 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
When light falls on an opaque object, light is obstructed and a dark patch is created on a screen kept behind is called shadow. This happens because light propagates in straight line.
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A shadow is a dark 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
When light falls on an opaque object, light is obstructed and a dark patch is created on a screen kept behind is called shadow. This happens because light propagates in straight line.