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al length will be 10 cm.    REASON :    when object is placed at 2F1 then the image is obtained at 2F2    in this case , u and v are equal in magnitude and opposite in sign   so by the data in the table , we can SAY that radius of curvature is 20 cm  , hence focal length will be 10 cm as it is half of the radius of curvature.(b) the sixth one is INCORRECT (u=-9 and v=+90)because in a CONVEX mirror , when an object is placed between the focus and the lens ... then the image is FORMED on the same side and is virtual .in this case , object is placed between focus and lens but the image is formed on the other side of the lens (bcause v = +ve) hence it is wrong



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