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so=15 cm
f=20 cm
s'=___?
penyelesaian:
1/s'=1/f-1/so
1/s'=1/20-1/15
1/s'=3-4/60
1/s'=-1/60
1/s'=60/-1
1/s'=-60 cm (bayangan terbentuk didepan cermin)
semoga membantu:3
semangat ya belajar nya:3