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f = 15 cm
ditanya : S'...?
jawab = 1/S + 1/S' = 1/f
1/S' = 1/f - 1/S
1/S' = 1/15 - 1/30 = 1/30
S' = 30/1 = 30 cm......(b)
jadikan sebagai yang terbaik::)
So = 30 cm
f = + 15 cm (+ karena lensa cembung)
Ditanya:
Si = ?
Jawab:
Si = (So x f) / (So - f)
Si = (30 x 15) / (30 - 15) = 30 x 15 / 15 = 30 cm
jawaban B