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this is an absolutely glorious experiment with light. this requires some dettol, a toy
laser pointer and an old bottle. take a few drops of dettol in a dropper and put it in
a mug full of water. then stir dettol and water well. now take a small plastic bottle
and make a small hole in the lid. it should be neat and clean hole. then shut the hole
in the lid with your finger and fill the bottle with dettol water. then take a toy laser and
shine it in the middle of the hole. as the water ejects from the hole, the light bends
into a curve. this is like total internal reflection. you can see this in darkness and
you can see a glorious curve of light almost like an arc bending and falling in a bowl
of water. its absolutely glorious and graphic light experiment.