irosha
irosha irosha
  • 04-08-2021
  • Physics
contestada

Clear umbra can be obtained by .................................

what is the word come to this blank?​

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deborah200614
deborah200614 deborah200614
  • 04-08-2021
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.
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