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Clear umbra can be obtained by ................................. what is the word come to this blank?​
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40 votes
40 votes
Clear umbra can be obtained by .................................

what is the word come to this blank?​

User Alexander Zak
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1 Answer

11 votes
11 votes
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.
User Robert Tomas G IV
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