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Verified answer
cermin cekung
s = 30 cm ← ruang 1
m = - 5 kali, maya
R = __?
m = f / (s - f)
-5 = f / (30 - f)
-150 + 5 f = f
4 f = 150
f = 75/2 cm
R = 2 f = 75 cm ← jwb