Solve the all parts of following problem given below:
Problem: A 1.5-cm-tall candle flame is 61cm from a lens with a focal length of 22cm.
Part I: What is the image distance?
Part II: What is the height of the flame's image?
I need help to finds the height of the flame's image and remember that an upright image has a positive height, whereas an inverted image has a negative height.