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f=1/p=1/2,5=0,4m=400cm
1/f=1/s+1/s'
1/40=1/25 + 1/s'
pada rabun dekat/rabun jauh s' selalu bertanda negatif.
1/40=1/25-1/s'
1/s'=1/25-1/40
1/s'=8/200 - 5/200
1/s'=3/200
s'=200/3
s'=66,67 cm
kalo cara cepat
p=100/s-100/s'
2,5=100/25-100/s'
2,5=4-100/s'
100/s'=4-2,5
100/s'=1,5
s'=100/1,5
s'=66,67 cm
P = 2,5 dioptri
Ditanya = s'
Jawab =