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pretty basic stuff, a ray of light is incident from a substance upon the surface of another substance with n=1. i can't remember the exact refractive index of the first material but it was about 1.4 or something, hmm. anyway, i worked out the incident abgle to be 47 degrees and to find the refractive angle used

sin incident angle x n1 = sin refractive angle x n2

seeing as n2 = 1 then you get

sin refracted angle = sin incident angle x n1

which ended up being about 1.09 or something, ok, a sine>1 ?

well i just pretended it was 1 and so worked out the refracted angle to be total, ie 90 degrees. was this the right thing to do? was this some measurment discrepancy i was supposed to disregard? help, i don't want to wait a month for results to understand this problem!