Magnification factor M = 6/2 = 3
and M = - v/u
where v is the image distance and u is the object distance.
=> v = - 3u = - 3(8) = - 24 cm
now use the lens formula
1/f = 1/v + 1/u
=> 1/f = - 1/24 + 1/8
=> f = 12 cm.
this is the focal length of the magnifying glass. The image formed will be virtual, magnified and upright (not inverted).
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