Asked by Ntakadzeni

A large bowl contains water 10cm deep and has a small electric lamp at the bottom.A disc of cardboard is floating on the surface with its centre vertically above the lamp,and is of such diameter that the lamp can just not be seen by a person looking into the water.calculate the diameter of the disc.
Answered by Malo
22,6cm
Answered by Anonymous
22,6 cm
Answered by sizwe
22.6 cm
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