Hoe does a matchstick be light up with a magnifying glass.

http://ncealevel2sci.wikispaces.com/file/view/lensmagnifying.png
According to my research:



Sunlight can be used as a focus at a point with the assist of a magnifying glass and when we place the match stick at that focus point,the match stick can get enough heat and it will light up.

Because friction produces heat so when the match stick strike against the the match box,the match stick lights up.

However without the match box,using the magnifying glass,the magnifying glass concentrates the heat and the light of the sun on the tip of the match stick,the tip of the match stick became hot and it light up.

http://www.arvindguptatoys.com/arvindgupta/ScienceAction3.pdf