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A student had a ball, a screen and a torch in working condition. He tried to form a shadow of the ball on the screen by placing them at different positions. Sometimes the shadow was not obtained. Explain.
 
The reason due to which shadow was not obtained are
 
(i) The from the ball.
 
(ii) The beam of light from the torch is to the screen on the ball.
 
(iii) The from the ball.