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dane r=20cm, p=4,
szukane x
1/f = 1/x + 1/y......f=r/2....1/f=2/r.....p=y/x.....y=px
2/r = 1/x + 1/px = [p+1]/px
x = r[p+1]/2p = 20cm *5 /8 = 100cm/8 = 12,5cm
Płomień świecy należy umieścić w odległości x = 12,5cm od zwierciadła.
..............................piozdrawiam