Question

A Ray of light is incident in glass on a glass-water boundary.The angle of incidence is 50°.Calculate the angle of refraction.Refractive index of glass=1.50 and refractive index of water=1.33.

Answer 1

sin i / sin r = μ glass / μ air

                = 1.127

sin 50 / sin r = 1.127

0.766 / sin r = 1.127

sin r = 0.680

r = 42.843  °

Answer 2

Given:

• $i=50^{0} ,w^{n} =1.5, s^{n} = 1.33,r=?$
• we know the basic fomula,

                 $^{s} _{w} {n} =\frac{sini}{sinr}$

• And we can write as,

                      $=\frac{w^{n} }{s^{n} }$

• Now lets find r,

                  $sinr=\frac{w^{n}sini }{s^{n} }$

                         $=\frac{1.5Xsin50^{0} }{1.33}$

                  ∴ $r=59.8$