Describe an experiment to determine the refractive index of glass, using a glass block.
Using the formula for refractive index isn't too hard once you've tried it a few times...
taking the glass block from the worksheet in the previous post...
the angle of incidence is 40°
and the angle of refraction is 25°
so the refractive index of a perspex block is roughly 1.52 (but remember there aren't any units)