A ray of light is incident on a glass surface at an angle of 50° with the corresponding angle of refraction 30°. Find the value of the R.I. of glass.
R.I. = sin i/sin r
_{a}μ_{g }= sin i/sin r = sin 50^{0}/sin 30^{0} (∠i = 50^{0} and ∠r = 30^{0})
= 0.7660/0.5000
_{a}μ_{g }= 0.1532.