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Tinggi benda (h) = 3cm
Jarak benda (s) = 6cm
Jarak fokus (f) = 15cm
Ditanya: Tinggi bayangan (h')....?
Jawab:
1/s' = 1/f -1/s
1/s' = 1/15 - 1/6
1/s' = 2/30 - 5/30
1/s' = -3/30
s' = -10
s'/s = h'/h
10/6 = h'/3
h' = (10 x 3)/6
h' = 5cm
jadi tinggi bayangan adalah 5cm
1/6 + 1/Si = 1/15
1/Si = 1/15 - 1/6
1/Si = 2/30 - 5/30
1/Si = -3/30
Si = -30/3
Si = -10
M = Si/So (sifat mutlak, tidak memakai negatif harus positif)
= 10/6
M = Hi/Ho
10/6 = Hi/3
6Hi = 3x10
6Hi = 30
Hi = 5 cm
Ket: Si= jarak bayangan
So= jarak benda
M = perbesaran
Hi= tinggi bayangan
Ho= tinggi benda