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s = 15 cm
R = 20 cm ⇒ f = 10 cm
dit :
a) s'
b) sifat bayangan
jawab :
a) 1/s' = 1/f - 1/s
1/s' = 1/10 - 1/15
1/s' = (3 - 2) / 30
1/s' = 1 / 30
s' = 30 cm
b) sifat bayangan :
M = - s' / s
M = - 30 / 15
M = - 2
Maka : nyata, terbalik, dan diperbesar
Semoga membantu ^_^