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P = 25 dioptri
Sn = mata normal = 25 cm
dit : M ?
penyelesaian :
P = 1/f
25 = 1/f
f = 1/25
f = 0,04 m
f = 4 cm
M = (Sn/f) + 1
= (25/4) + 1
= 6,25 + 1
= 7,25 kali