here,
the angle of reflection = 28 degree
the angle of incidence , i = angle of reflection
i = 28 degree
the angle of refraction , r = 45 degree
let the index of refraction be n
using snell's law
n /1 = sin(r) /sin(i)
n = sin(45) /sin(28)
n = 1.51
the index of refraction of substance is 1.51
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