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so = 20 cm
f = 130 cm
Dit : si, sifat bayangan
Jawab :
1/si = 1/f - 1/so
1/si = 1/130 - 1/20
1/si = 2/260 - 13/260
1/si = -11/260
si = -23,63
Sifat bayangan = maya, tegak, dan diperbesar