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P = 20 dioptri
Sn = 25 cm
DIT : M ?
Dijwb :
f = 100/20
= 5 cm
maka :
a. Mata tak berakomodasi :
M = Sn/f
= 25/5
= 5 kali
b. Mata Berakomodasi Maksimum :
M = Sn /f + 1
= 25/5 + 1
= 5 + 1
= 6 kali
c. Mata berakomodasi pda jarak 50 cm
M = Sn/f + 1
= 50/5 + 1
= 10 + 1
= 11 kali