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s= 5cm
R =20 cm
a.) s'=?
b.) M=?
f = 1/2 R = 10 cm
a.)
1/f = 1/s + 1/s'
1/10 = 1/5 + 1/s'
1/s'= 1/10 - 1/5
1/s' = 1/10 - 2/10 = -1/10
s' = -10cm
b.)
M = s'/s
M= 10/5 = 2 kali