Question

Benda berada 24 cm di depan cermin cekung jika jarak fokus cermin 18 cm, perbesaran yang terjadi adalah...

Answer 1

1/f = 1/s + 1/s'
1/18 = 1/24 + 1/s'
1/s' = 1/18 - 1/24
1/s' = (4-3)/72
s' = 72

M = 72/24
M = 3x

Answer 2

Diketahui = S₀ = 24 cm
                    f = 18 cm
DItanya = M..?
Jawab
1/S₁ = 1/f - 1/S₀
1/S₁ = 1/18 - 1/24
1/S₁ = 4-3/72
1/S₁ = 1/72
   S₁ = 72 cm

M = | S₁/S₀ |
M = | 72/24 |
M = 3 Kali