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asumsinya benda ditaruh dimana ? saya anggap 8 cm di depan cermin cekung
letak bayangan = 1/s +1/s' = 1/f
1/8 +1/s' = 1/40
1/s' = 1/40-1/8
1/s' = 1/40-5/40
1/s' = -4/40
s'=-10 cm
nilai s' = -10 menunjukkan bayangan di belakang cermin,
perbesaran = s'/s = 10/8
tinggi bayangan = perbesaran * tingi benda = 10/8*8 = 10 cm