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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: