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f = 1/2.30
f = 15 cm
1/s + 1/s' = 1/f
1/20 + 1/s' = 1/15
1/s' = 1/15 - 1/20
1/s' = 4/60 - 3/60
1/s' = 1/60
s' = 60 cm
M = | s'/s |
M = | 60/20 |
M = 3 kali
h' = M.h
h' = 3.2
h' = 6 cm