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Pmata=100cm
Pbenda=25cm
dit
P kacamata
100/Pmata+Plensa=100/Pbenda
100/100+Plensa=100/25
Plensa=100/25-100/100
Plensa=400/100-100/100
Plensa=300/100
Plensa=+3
P=100/f
3=100/f
3f=100
f=33.3