Dik : f = 8cm, so = 30cm, ho = 3cm. Dit : si =?, M = ?, hi = ?, sifat bayangan = ?

1. 1/f = 1/s + 1/s'
1/8 = 1/30 + 1/s'
1/8 - 1/30 = 1/s'
15/120 - 4/120 = 1/s'
11/120 = 1/s'
120/11 = s'

2. M = s'/s
M = 120/11 ÷ 30
M = 120/11 × 1/30
M = 4/11

3. M = h'/h
4/11 = h'/3
12/11 = h'

semoga membantu, koreksi bila ada yang salah