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Jawaban:
Cermin cekung
s = 30 cm
f = 20 cm
a. Gambar di bawah
b. Sifat : Nyata, terbalik, diperbesar
c. s' = ?
1/f = 1/s + 1/s'
1/20 = 1/30 + 1/s'
1/20-1/30 = 1/s'
3/60-2/60 = 1/s'
1/60 = 1/s'
s' = 60 cm
d. M = ?
M = s'/s = 60/30 = 2
Penjelasan: