on a sunny day when we pass under a tree covered by a large of leaves , we see bright circular patches of light on the ground 1) what are the bright patches known as? 2) name the source of light and screen in a case

a) these are the pin holes of nature. 
b) source of light = Sun. Screen = Ground 

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pinholes of nature
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yjt
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                 K,M,M,M,
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good
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