The focal length of a thin biconvex lens is 20 cm

PHYSICS · Subjective · CBSE · Physics · Light — Reflection and Refraction · Light — Reflection and Refraction

Problem

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 m25m_{25} to m50m_{50} . The ratio m25m50\frac{m_{25}}{m_{50}} is

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