From lens formula,
1/f = 1/u + 1/v
here, u = distance of lens from object = +2.0 m
v = distance of image from lens = +8.0 m
f = focal length of lens = ??
So, 1/f = 1/2.0 + 1/8.0
f = (8*2)/(8+2)
f = +1.6 m
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