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1/jarak benda = 1/36 - 1/12
1/jarak benda = - 1/18
Jarak benda = -18 cm (perkalian silang)
Kalau cari tinggi benda,pakai persamaan Perbesaran (M)
M= Jarak bayangan : jarak benda
= 12 : -18
= - 2/3 kali
M= tinggi bayangan : tinggi benda
-2/3 = 9 : tinggi benda
Tinggi benda = 9 x - 3/2
= -13,5 cm
1/36 = 1/12 + 1/s.aksen
1/s.aksen = 1/36 - 1/12
1/s.aksen = -2/36
s.aksen = -18 (maya)
perbesaran = mutlak dari s' / s = -18/12 = 0,5
tinggi benda = h' / perbsrn = 9 / (0,5) = 4,5
atau cara : h'/h = s'/s --> h'/h = -18/12... h = h'/0,5 = 9/0,5 = 4,5