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An object is put at a distance of 5cm from the first focus of a convex lens of focal length 10cm. If a real image is formed, its distance from the lens will beA. 15 cmB. 20 cmC. 25 cmD. 30 cm |
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Answer» Correct Answer - 4 `(1)/(v)-(1)/(u)=(1)/(f)` `(1)/(v)-(1)/(-15)=(1)/(10)` `or(1)/(v)=-(1)/(15)+(1)/(10)` `or(1)/(v)=(-2+3)/(30)` or v = 30 cm |
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