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b.1/s' = 1/f - 1/so
1/s' = 1/50 - 1/75
1/s' = 3/150 - 2/150
1/s' = 1/150
s' = 150 cm
c. M = | s'/so | = 150/75 = 2 kali
d. nyata, terbalik, diperbesar