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s = 30 cm
R = 20 cm
h = 10 cm
ditanya =
h' = ...
dijawab =
2 / R = 1 / s + 1 / s'
1 / s' = 2 / R - 1 / s
= 2 / 20 - 1 / 30
= 6 / 60 - 2 / 60
1 / s' = 4 / 60
s' = 60 / 4
s' = 15 cm
M = - s' / s
= - 15 cm / 30 cm
= - 0,5 kali
M = h' / h
h' = M . h
= 0,5 . 10 cm
= 5 cm