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1/f = 1/s + 1/s'
1/s' = 1/f - 1/s
1/s' = 1/20 -1/30
1/s' = 10/600
jadi letak bayangan s' =600/10= 60 cm
perbesaran M = s'/ s = 60 / 30 = 2 kali
tinggi bayangan
M = h' / h
h' = M . h = 2 . 5 = 10 cm
sifat bayangan
nyata. tegak. diperbesar
semoga bermanfaat guys:-)