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20 cm / 2 = 10 cm
2) Cari Jarak Bayangan
1/s' = 1/f - 1/s
1/s' = 1/10 - 1/15
1/s' = 3/30 - 2/30
1/s' = 1/30
s' = 30 cm
3) Cari Perbesaran bayangan
M = s'/s
M = 30 cm / 15 cm
M = 2 Kali
4) Sifat bayangan
Jika bayangan ada di depan cermin maka bayangan :
Nyata, Terbalik, Diperbesar