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Calculate the distance at which an object should be placed in front of a convex lens of focal length 100 cm to obtain an erect image of double its size. |
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Answer» SOLUTION :f=100 CM `m=v/u=2` `v=2U` `1/f=1/v+1/u` `1/100=1/(2u)-1/u` `1/100=(1-2)/24` `=-1/24` `:.2u=-100` `:.u=-50cm` |
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