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so = 10 cm
R = 2f = 15 cm
Dit : si, sifat bayangan, M
Jawab :
1/si = 1/f - 1/so
1/si = 1/7,5 - 1/10
1/si = 4/30 - 3/30
1/si = 1/30
si = 30 cm
sifat bayangan = nyata, terbalik, dan diperbesar
M = si/so
M = 30/10
M = 3