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JEE ADVANCE 2010
paper 1
Question
The focal length of a thin biconvex lens is 20 cm . When an object is moved from a distance of 25 cm in front of it to 50 cm , the magnification of its image changes from $\mathrm{m}_{25}$ to $\mathrm{m}_{50}$. The ratio $\frac{\mathrm{m}_{25}}{\mathrm{~m}_{50}}$ is
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