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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

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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 ...

Solution Summary

Solution gives an example experiment on how a lens works and gives the proper explanation.