CERMIN CEKUNG
Jarak bayangan
f = 0,5 R = 0,5. 30
f = 15 cm
1/f = 1/s + 1/s'
1/15 = 1/20 + 1/s'
1/s' = 1/15 - 1/20 = 1/60
s' = 60 cm
Perbesaran
M = s'/s = 60/20 = 3
Tinggi bayangan
M = h'/h
h' = M.h = 3. 4
h' = 12 cm
Jawaban. A
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CERMIN CEKUNG
Jarak bayangan
f = 0,5 R = 0,5. 30
f = 15 cm
1/f = 1/s + 1/s'
1/15 = 1/20 + 1/s'
1/s' = 1/15 - 1/20 = 1/60
s' = 60 cm
Perbesaran
M = s'/s = 60/20 = 3
Tinggi bayangan
M = h'/h
h' = M.h = 3. 4
h' = 12 cm
Jawaban. A