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Sn = 25cm
PP = 50cm
Ditanya
jenis lensa
dan fokus.
P = 100/Sn - 100/PP
P = 100/25 - 100/50
P = 4 - 2
P = 2 D
f = 100/P
f = 100/2
f = 50cm
f + lensa cembung