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  4. 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 m 25 to m 50. The ratio ( m 25/ m 50) is

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Q. 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 $m _{25}$ to $m _{50}$. The ratio $\frac{ m _{25}}{ m _{50}}$ is ______

JEE AdvancedJEE Advanced 2010

Solution:

$m =\frac{ f }{ f + u }$