4.
nair = 1
ns = index of refraction of solution = ?
i = angle of incidence = 2
r = angle of refraction = 9.24
using snell's law
nair Sini = ns Sinr
(1) Sin2 = ns Sin9.24
ns = 0.22
' = wavelength in the solution = wavelength in vaccum /ns = 633.8/0.22 = 2880.91 nm
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