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f = M/2 = 80/2 = 40cm
1 = 1 + 1
f s s1
1 = 1 + 1
40 20 s1
1 = 1 - 1
s1 40 20
= 1 - 2
40 40
= -1/40
s1 = -40
letak bayangan = 40cm
perbesaran = s1/s
= 40 /20
= 2
ukuran asli × perbesaran
6cm x 2 = 12 cm
ukuran bayangan = 12 cm
sifat = maya, tegak ,diperbesar