x = 2 m
y = 50 cm = 0,5 m
szukane:
R = ?
1/f = 1/x + 1/y = (y+x)/xy
f = xf/(y+x) = 2m·0,5m/(2m+0,5m) = 1m²/2,5m = 0,4 m
f = 40 cm
R = 2f = 80cm/
R = 80 cm
========
Dane:
x= 2 m
y = 50 cm =0,5 m
f=?
r=?
1/f = 1/x+1/y
1/f = 1/2 + 1/0,5
1/f= 5/2
5f= 2 /: 5
f = 2/5 = 0,4 m
f = 1/2 r
r = 2*f
r = 2*0,4 = 0,8 m
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x = 2 m
y = 50 cm = 0,5 m
szukane:
R = ?
1/f = 1/x + 1/y = (y+x)/xy
f = xf/(y+x) = 2m·0,5m/(2m+0,5m) = 1m²/2,5m = 0,4 m
f = 40 cm
R = 2f = 80cm/
R = 80 cm
========
Dane:
x= 2 m
y = 50 cm =0,5 m
f=?
r=?
1/f = 1/x+1/y
1/f = 1/2 + 1/0,5
1/f= 5/2
5f= 2 /: 5
f = 2/5 = 0,4 m
f = 1/2 r
r = 2*f
r = 2*0,4 = 0,8 m