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f = 1/2.0,18
f = 0,09 m
1/s + 1/s' = 1/f
1/0,12 + 1/s' = 1/0,09
1/s' = 1/0,09 - 1/0,12
1/s' = 8/0,72 - 6/0,72
1/s' = 2/0,72
2s' = 0,72
s' = 0,72:2
s' = 0,36 m
s' - s = 0,36 - 0,12
s' - s = 0,24 m
Jawaban: A
so = 0,12 m
= 12 cm
R = 0,18 m
= 18 cm
ditanya =
jarak benda dengan bayangan = ...
dijawab =
2 / R = 1 / so + 1 / si
1 / si = 2 / R - 1 / so
= 2 / 18 - 1 / 12
= 4 / 36 - 3 / 36
1 / si = 1 / 36
si = 36 cm
jarak benda dengan bayangan =
36 cm - 12 cm
24 cm
0,24 m (a)