A student wants to project the image of a candle flame on the walls of school laboratory by using a lens:
1.Which type of lens should he use and why?
2. At what distance in terms of focal length ‘f’ of the lens should be placed the candle flame so as to get
- a magnified, and
- a diminished image respectively on the wall?
3.Draw ray diagram to show the formation of the image in each case.