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1/s' = 1/f - 1/s
1/s' = 1/20 - 1/50 = 3/100
s' = 100/3 = 33 1/3
B) tinggi bayangan
-h'/h = -s'/s
-h'/12 = -(33 1/3)/50
-50 h' = -(33 1/3) x 12 =-400
h' = -400/-50 = 8 cm
So = 50 cm
f = 20 cm
ditanya : Si dan h'
= -
= -
=
=
Si =
= 33,3 cm
=
=
=
h' = x 12
h' = 8 cm