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PP = 100 cm
P....?
P= 100/PPN - 100/PP
= 100/25 - 100/100
= 4 - 1
= 3 dioptri
maaf kalau salah, coba dicek lagi
titik dekat: 100 cm
dit: dioptri?
dij: 100/s - 100/ PP
= 100/ 25 - 100/100
= 4-1
=3 dioptri