When a lighted matchstick is shown before another light source, the shadow of the matchstick is formed on a screen

Question: When a lighted matchstick is shown before another light source, the shadow of the matchstick is formed on a screen but not the shadow of the flame. Why is it so?
- Keywords:
  fire,
  flame,
  light,
  match,
  matchstick,
  shadow
Asked by queensangels2012 to Anna on 30 Jun 2012.
- Angharad Davies answered on 30 Jun 2012:
  
  That’s a good puzzle – I think it would be because the flame is throwing off light itself so a shadow wouldn’t form behind it – it would light up its own shadow.

Question: When a lighted matchstick is shown before another light source, the shadow of the matchstick is formed on a screen but not the shadow of the flame. Why is it so?