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f = 180 cm
Dit : s' = ___?
Penyelesaian : 1/f = 1/s + 1/s'
1/180 = 1/60 + 1/s'
1/180 - 1/60 = 1/s'
1/180 - 3/180 = 1/s'
- 2/180 = 1/s'
-90 cm = s'
2. Dik : s' = 24 cm
f = 6 cm
Dit : s = ___?
Penyelesaian : 1/f = 1/s + 1/s'
1/6 = 1/s + 1/24
1/6 - 1/24 = 1/s
4/24 - 1/24 = 1/s
3/24 = 1/s
8 cm = s
3. Dik : h = 8 cm ; s = 24 cm ; f = -12 cm
Dit : s' ; M = ___?
Penyelesaian : 1/f = 1/s + 1/s'
- 1/12 = 1/24 + 1/s'
-1/12 - 1/24 = 1/s'
-2/24 - 1/24 = 1/s'
- 3/24 = 1/s'
-8 cm = s'
M = s' / s
= -8 cm / 24 cm
= 1/3 kali
4. Dik : s = 15 cm ; f = -10 cm
Dit : s' = ___?
Penyelesaian : 1/f = 1/s + 1/s'
-1/10 = 1/15 + 1/s'
-1/10 - 1/15 = 1/s'
-3/30 - 2/30 = 1/s'
-5/30 = 1/s'
- 6 cm = s'
5. Dik : s = 20 cm ; f = 30 cm
Dit : s' = ___?
Penyelesaian : 1/f = 1/s + 1/s'
1/30 = 1/20 + 1/s'
1/30 - 1/20 = 1/s'
2/60 - 3/60 = 1/s'
-1/60 = 1/s'
-60 cm = s'
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