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R= 8
f = R/2 = 4
1/f = 1/s + 1/s'
1/4 = 1/10 + 1/s'
1/s' = 1/4 - 1/10 = 6/40
s' =40/6 = 6, 67 cm di dpn cermin
h'/h = s'/s
h' = (40/6 )/10 x 1,5
h' = 2/3 x 3/2 = 1 cm