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Why spark is seen while removal of synth...

Why spark is seen while removal of synthetic clothes in dark in winter?

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You may have seen the trick where a tablecloth is jerked from a table, leaving the dishes that were on the cloth nearly in their original positions. What do you need to perform this successfully? Which cloth should we use? Is it cloth made of thick cotton or thin silk? Should the dishes possess large mass or small mass? Is it better to pull the cloth with a large force or pull it with a gentle and steady force?

Answer the following questions: (c) When a tiny circular obstacle is placed in the path of light from a distant source, a bright spot is seen at the centre of the shadow of the obstacle. Explain why?