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s = 75 cm
a)P=1/f
P= 1/0,5
P=2 dioptri
b)1/s "=1/f - 1/s benda
1/s "=1/50 - 1/75
1/s " = 3/150 - 2/150
s "= 150 cm
c) M=s" /s
M= 150/75
M = 2 kali
d.