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h = h'
maka M =1
M = s'/s
1 = s' / 20
s' = 20 cm
1/f = 1/s + 1/s'
1/f = 1/20 + 1/20
1/f = 2/20
f = 20/2
f = 10 cm
P = 100/f
P = 100/10
P = 10 Dioptri