Answers

2016-01-28T20:12:03+05:30
1. P is2D . f=1/p . =1/2=0.5m=50cm(convex) 2. P=-4d . f=1/p . =1/-4=-0.25=-25cm(concave)
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2016-01-28T20:53:35+05:30
Search wikipedia and thank you
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