Basically an object that does not allows any light to pass through will form a shadow. Shadows are formed by light, because if light shines onto an object, and the object blocks the light, the light will go sideways of the object, and therefore, a shadow is formed. Light can only travel in straight lines.
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The light won't go sideways.The light which is blocked doesn't goes any where. It stays blocked. An object that blocks light will form a shadow.
Light emitted from a point source travels all around the point source.
Hope the diagram helps!!!
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