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s = 20 cm
R = - 15 cm
ditanya M = ?
dijawab:
So = 20 cm
F = ½ (-15)
= -15/2
1/Si = 1/f -1/So
1/Si = 1/(-15/2) - 1/20
1/Si = -2/15 -1/20
1/Si = -8/60 -3/60
1/Si = -11/60
Si = -60/11
M = | Si/So |
M = | (-60/11)/20)
M = 3/11 (A)