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The focal length of a thin biconvex lens...

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 magni-fication of its image changes from `m_(25) to m_(50)`. The ratio `(m_(25))/(m_(50))` is.

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PHYSICS GALAXY - ASHISH ARORA-GEOMETRICAL OPTICS-Unsolved Numerical Problems
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