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h = 1 m
= 100 cm
f = - 0,5 m
= - 50 cm
s = 2 m
= 200 cm
ditanya =
h' = ...
dijawab =
1 / f = 1 / s + 1 / s'
1 / s' = 1 / f - 1 / s
= - 1 / 50 - 1 / 200
= - 4 / 200 - 1 / 200
1 / s' = - 5 / 200
s' = 200 / - 5
s' = - 40 cm
M = - s' / s
= - (- 40 cm) / 200 cm
= 40 / 200
= 0,2 kali
M = h' / h
h' = M . h
= 0,2 . 100 cm
= 20 cm