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Clear umbra can be obtained by ................................. what is the word come to this blank?
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Clear umbra can be obtained by ................................. what is the word come to this blank?
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Jun 1, 2022
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Clear umbra can be obtained by .................................
what is the word come to this blank?
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Connor
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Clear umbra can be obtained when the electric torch is kept at a considerable distance from the ball . So the light source should be kept far from the object to obtain a clear and sharp umbra.
Christophe Blin
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Jun 7, 2022
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Christophe Blin
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