the magnification of its image changes from m25 to m50.

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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.
09
Oct
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 focal length of a thin biconvex lens is 20 cm. When an object is moved [...]
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