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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
ditanya : Pp ... ?
jawab : P = 4-100/Pp
2,5 = 4-100/Pp
2,5-4 = -100/Pp
-1,5 = -100/Pp
-1,5 Pp=-100
Pp = -100/-1.5 = 66,67 cm