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s = 20 cm f= 12 cm 1/f = 1/s' + 1/s 1/12 = 1/s' + 1/20 s' = 30 cm
m = -s'/s = -30/20 = - 1.5
Now use: m = h'/h -1.5 = h'/10 h' = -15 cm negative sign shows that image is inverted Answer: 15 cm
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