The similarity between seen an object and seeing a shadow is their shape.
The shape of shadow of an object is always similar with object.
If object is in standing position, its image also is in standing position. The size of the shadow sometime greater than the object or less than the object. It never same.
If object is in sitting position, its image also is in sitting position.
If the source of light is on the back side, the shadows formed is in our front side and always act opposite to our activity.
For example, if we raise your left hand, the shadow appear to be raise right hand.
If the source of light is on the front side, the shadows formed is in back side and always act similar like us.
For example: if we raise your left hand, the shadow also appear to be raise left hand.
Everything changes at different position of source of light but shape never changes.
Thus, we concluded that similarity between seen an object and seeing a shadow is their shape.
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