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How a lens work - inversion of images

I recently saw this done on a science programme but no explanation was given:
When you use the stem of a glass to act as a lens to view coloured writing, red
writing is inverted and green writing is not - why? please use as much detail as possible

Solution Preview

Actually, there must be an inversion if the glass stem is acting as a lens. Please read the following, this is about an experiment:

An optics inversion tube can be used to conduct an inquiry activity that will help students understand how the lens works: Obtain pieces of glass rods, or fill up test tubes with water and cap or cover with pieces ...

Solution Summary

Solution gives an example experiement and gives the proper explanation.