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cermin cekung
s = 10 cm
M = 3
Ditanya: R....?
jawab:
M = f/(s-f)
3 = f/(10 - f)
3(10 - f) = 3f
30 - 3f = 3f
3f + 3f = 30
6f = 30
f = 30/6
f = 5cm
R = 2.f
R = 2.5
R = 10 cm
jari2 kelengkungan cermin = 10cm