A magnifying glass has a convex or converging lens. When a parallel beam of light passes through the lens, the light is brought to a focus point. Light that enter the lens at a single point are sufficient to raise the temperature and the temperature is high enough for a chemical reaction to occur.
To lit up the match stick, hold your magnifying glass at a comfortable direction and slighty 0.5m - 1.0m away from the match stick. Try adjusting the glass to redirect the sunlight and focus it directly on the black head of the match stick. Try not to move your hands and if you are lucky enough, with the strong sunlight, within a minute you can lit up your match stick!
Believe it or not, check out the below video!
http://hubpages.com/hub/magnifying-glass
http://matchsticks.com/Start_a_Fire_Without_Matches.htm
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