Science Buddies: "Ask an Expert"

Hey I need help to come up with a topic name for my experiment.

The Experiment is basically about the refractive index of light. This is a part from my lab report that will explain it a little bit better "Once the light travels from a more dense to a less dense medium there is an angle over which the rays of light do not leave the more dense medium. The angle is called the critical angle. If we reverse the direction of the propagation of light the rays will enter the more dense medium irrespective of the angle however the refracted ones will never exceed the critical angle. This a consequence of the principle that the direction of the propagation of light can be reversed however the path of rays needs to remain the same."

I already wanted to thank you right now for your attention.
I hope you can help me to find the good title for my experiment.

Note from moderator: I'm moving this to the Physics forum where those experts will have a chance to notice your question! Thanks!

Hi MrRawers,
What mediums did you use for your experiment? I was thinking that your title could be as simple as "The significance of "critical angle" for Lights propagation between medium X and medium Y"

Good Luck and please let us know if there's anything else we can do to help.
Willey