General Science Physics

ଏକ ଗୋଲାକାର ଦର୍ପଣର ବକ୍ରତାର ବ୍ୟାସାର୍ଦ୍ଧ 40 ସେମି । ଏହାର ଫୋକାଲ୍ ଲମ୍ବ ________ ସେମି ।

1
30
2
20
3
40
4
10

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