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Object distance, u, from the lens = 10 cm

Image distance, v, to the lens = 10 cm + 10 cm

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Apply the lens formula to determine the focal length, f, of the lens.

$\frac{1}{f}$ = $\frac{1}{u}$ + $\frac{1}{v}$

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= $\frac{2 + 1}{20}$

$\frac{1}{f}$ = $\frac{3}{20}$

Find the inverse of both sides, so that;

f = $\frac{20}{3}$

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f = 6.67 cm

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