An object is placed at a distance of 20 cm from a convexlens of focal length 10 cm. The
image is formed at a distance of:
The correct option is C.
 Use lens formula, $$\frac{1}{v}$$ - $$\frac{1}{u}$$ = $$\frac{1}{f}$$
Where, u = -20Â cm , f = +10 cmÂ
          $$\frac{1}{v}$$ = $$\frac{1}{f}$$ + $$\frac{1}{u}$$
           = $$\frac{1}{10}$$ - $$\frac{1}{20}$$ = $$\frac{1}{20}$$
$$\Rightarrow$$ Â v= 20cm
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