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Solid angle subtended by hemisphere at centre is ...... . |
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Answer» Solution :Surface area of sphere of radius `r=4pi r^(2)` `:.` Surface are of HEMISPHERE `DeltaA=2pi r^(2)` `:.` Solid ANGLE `=(DeltaA)/(r^(2))=(2pir^(2))/(r^(2))=2pi sr` |
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