Sebuah benda diletakkan 20 cm di depan cermin cekung berjari-jari 30 cm. jarak bayangan benda terhadap cermin adalah . . .. *
2/r = 1/s + 1/s’
2/30 = 1/20 + 1/s’
s’ = 60 cm [answer.2.content]
2/30 = 1/20 + 1/s’
s’ = 60 cm [answer.2.content]
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