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The focal length of a thin biconvex lens is 20 cm . When an ob
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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 50cm, the magnification of its image changes from to . The ration is

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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 50cm, the magnification of its image changes from to . The ration is
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Question Text
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 50cm, the magnification of its image changes from to . The ration is