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• lup
P = 20 D
m = __?
jarak fokus lup
f = 100/P
f = 100/20 = 5 cm
perbedaan sudut maksimum, jika pengamatan berakomodasi
m = Sn / f + 1
m = 25/5 + 1 = 6 kali
perbedaan sudut minimum, jika pengamatan tidak berakomodasi
m = Sn / f
m = 25/5 = 5 kali
Rentang perbesaran yang mungkin
5 ≤ m ≤ 6 ← jwb