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x+y = 125 cm
p = 4
p = y/x
x+y = 125 cm
y/x = 4
y = 4x
x+4x = 125
5x = 125
x = 25
y = 4x
y = 4 *25 = 100 cm
korzystamy z równania soczewki:
1/f = 1/x+1/y
1/f = 1/25 + 1/100 ; wspólny mianownik 100
1/f = 4/100 +1/100
1/f = 5/100
f = 100/5
f = 20 cm