why is the shadow of an object formed opposite to the direction of light source

Shadows form when something comes into the path of light through which light rays couldn 't pass as light travels in straight line. And then it forms the shadow. Shadow is that part of object which does not allow light to pass through it that is why it seems dark but the light from the edges of object pass. And this is the reason it forms on the opposite side of the light source.

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Because, light travels only through straight line
so it is not possible to form shadows other than in the oppposite side of light source
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SHADOWS

shadows is one of the properties of rectilinear property of light....
when the incident ray is blocked by an opaque object there is a dark region this dark region is called a shadow...
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because light travels only through straight line
 
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because light travels in one line
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