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s':-60cm
Ditanya:R?
JAWAB:1/f=1/s+1/s'
1/f=1/-40+1/-60
1/f=3/-120+2/-120
f=-120/5=-24
sedangkan R=2f
R=2×-24
R=-48 :)
1/f = 3/120 +2/120
1/f = 5/120
f = 120/5
f = 24 cm