How many places can you put the lens to form a well-focused image of the candle flame on the wall?
A 4.0-cm-tall candle flame is 2.0 m from a wall. You happen to have a lens with a focal length of 42cm.
A) How many places can you put the lens to form a well-focused image of the candle flame on the wall?
B) What are the distance between the candle and the lens for each location? Answer: 60 and 140 cm
