Despite it's far to be a perfect prism, you can use it for personal or classroom basic optical experiments.
As it is filled with water, its refractive index is of about 1.33.
If it was entirely made of glass or acrylic glass, its refractive index would be about 1.5.
Actually, in this prism, four refractions occurs :
1 - air (1.0) to glass (1.5)
2 - glass (1.5) to water (1.33)
3 - water (1.33) to glass (1.5)
4 - glass (1.5) to air (1.0)
Step 1: What do you need ?
- tools required to cut acrylic glass
- transparent adhesive tape (scotch-tape)
- something to glue acrylic glass
- a tool to drill acrylic glass
- a rubber stopper (or anything that will do the job)
- a funnel ( see here if required : http://www.instructables.com/id/Improvised-Tiny-Funnel/ )
- It is, of course, possible to use real glass instead of acrylic glass. Though, it would be difficult to drill it.
Step 2: Three rectangles ...
Mine are squares of 9 by 9 centimeters, and I used a manual saw.
If you use an electric saw, be careful : acrylic glass may melt because of the friction.
Of course, it must be possible to use classical glass cutting techniques.
- Chain your rectangles with transparent adhesive tape.
And build-up your prism.
The adhesive tape should be inside, as you're supposed to glue the external edges.
- Glue the edges.
Be careful or you'll get leaks !
- And let it dry.
Once dry, it is possible to leave adhesive tape inside the prism. It does not really matter as long as it is transparent and don't cover too much of the surface.
Step 3: Two triangles ...
- Drill a hole into one of the two triangles.
Actually, it is possible to drill a hole in both triangles. This would help to easily flush the prism if required.
Make the hole near one of the points. This will help to easily evacuate an eventual bubble of air.
- Glue them on each side of your prism.
- Let it dry.