A ray of light traveling from glass into ethyl alcohol is...
A ray of light traveling from glass into ethyl alcohol is incident at the boundary at an angle of incidence 30o. Calculate the angle of refraction.
[Refractive index of glass =1.5; refractive index of ethyl alcohol = 1.36]
27o
33.5o
51.7o
72.8o
Correct answer is B
The angle of incidence l = 30º
The angle of refraction , r =?
The refractive index of glass ng = 1.5
The refractive index of ethyl alcohol, ne = 1.36
from snell's law :
neng=sinisinr
\frac{1.36}{1.5} = \frac{sin30º}{sinr}
1.36sinr = 1.5 x sin30º
sinr = \frac{1.5 \times sin30º}{1.36}
sinr = 0.5515
r = sin^{-1}(0.5515)
r = 33.5º