Raju says a red ball makes a red shadow and a blue ball a blue shadow, because a shadow takes the…

Why

Raju's idea has a logic — the ball is red, so its shadow feeling red seems to follow. But think about what a shadow actually IS: not a picture of the object, just the dark patch where the object blocked light from reaching the ground. A shadow has no colour of its own because it's an ABSENCE of light, not a copy of the thing. The red ball stops light whatever its colour; behind it is simply less light, so the shadow is dark. Its shape matches the ball, but never its colour. Test: a red toy and a blue toy of the same shape throw the very same dark shadow — swap them and you can't tell which is which by the shadow. The shadow is dark: it marks where light was blocked, and blocked light has no colour to give.