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Geometrical Optics question

2010 · Shift 1 · Q81
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Geometrical Optics question

2010 · Shift 1 · Q81

JEE AdvancedPhysicsGeometrical OpticsNumerical+3 / −1
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 m25 to m50. The ratio m25m50{{{m_{25}}} \over {{m_{50}}}}m50​m25​​ is ‾\underline{\hspace{2cm}}​.
Numerical answer
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