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Take a torch and a book …

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Take a torch and a book of red colour. Now cast its shadow on the wall. a) What is the colour of its shadow on the wall? * Bring the torch near to the book. b) How does the size and shape of the shadow change? * Now take the torch away from the book. c) What happens to the shadow? *Replace the book with a sheet of transparent plastic. d) How does the shadow change? Is it now much lighter? Why?
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