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The shadow is formed when some opaque object blocks light rays i.e. doesn't allow the light to go to the other side so since no light gets reflected so the shadow appears to be black.
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ok but why only black why not indigo red etc
cause no colour is there
as the opaque object blocks the rays of light it appears black
If there is a single light source, and the shadow is being cast by an opaque object between that lignt and the surface, the shadow will beblack because no light is reaching the surface where it is blocked by the object.
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