Physics Refraction practical - scaffolded worksheet with instructions

This has been designed so that there are four practice slots for students to place glass or perspex blocks onto before carrying out the refraction practical.
I have found that this served as great support even for more able students as it breaks down the task into bitesized chunks. Gradually students have to add more information to the diagrams as they go on. (e.g. adding the normal themselves)
The main advantage I would immediately be able to tell if students were not measuring the angle of incidence or angle of refraction correctly when they carried out this practical as I know what they will be in advance of students measuring them (something loads of students get wrong!)

Make sure you change the size of the glass block on the worksheet to match the ones you are using in your science department. I have included instructions on how to do this on the worksheet.

All feedback is really appreciated,

Thanks,
Simon