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lens formula 1/F=1/V-1/U, F= +15 cm, U= -40cm , 1/15=1/V-(-1/40), 1/15-1/40=1/V, 40-15/600=1/V,. 25/600=1/V, V= +24 cm , m= V/U, m=24/-40 , m= -0.6 and m= Hi/Ho , Ho=10cm, -0.6=Hi/10 then Hi -6cm means image is inverted and it's real image
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