tolong gimana caranya

Diketahui
s = 12 cm
h = 2 cm
f = 10 cm

Ditanya
h' = ....

Penyelesaian
1/f = 1/s + 1/s'
1/s' = 1/f - 1/s
1/s' = 1/10 - 1/12
1/s' = 6/60 - 5/60
1/s' = 1/60
s' = 60 cm

M = | s'/s |
M = | 60/12 |
M = 5 kali

Perbesaran 5 kali
Tinggi bayangan menjadi
2 × 5 = 10 cm