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S' : 32 cm
Tanya : F
Jawab : 1/F = 1/S + 1/S'
= 1/18 + 1/32
= 32 + 18 / 576
1/F = 50 / 576
F = 576 / 50
= 11,52
jenis lensa lensa cembung
# Maaf jika salah, maaf juga jika anda tidak puas dg jawaban saya :)