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Distance between a fixed linear object a...

Distance between a fixed linear object and a fixed screen is 40cm .A thin convex lens of focal length 10cm is kept between object and screen such that object is perpendicular to the principal axis of lens as shown in figure.It is observed that for two different positions of lens images are formed on the screen.If size of images for the two different positions of lens are 9cm and 4cm then size of object in cm is......

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