Question

Light strikes a flat piece of uniformly thick glass at an incident angle of 60?. If the index of refractino of the glass is 1.5, and it has a width of 10 cm,

A) What is the angle of refractino in the glass?

B) What angle will the light leave the glass at on the other side?

Answer 1

Angle of incidence i = 60 ^o

Index of refraction of glass n = 1.5

Width d = 10 cm

(A). Angle of refraction r = ?

From Snell's law , sin i / sin r = n / n '

Where n ' = index of refraction of air = 1

            sin 60 / sin r = 1.5

                       sin r = sin 60 / 1.5

                             = 0.866 / 1.5

                            = 0.577

                         r = 35.26 ^o

(B).angle will the light leave the glass at on the other side = i

Since medium on other side is air

i.e.,angle will the light leave the glass at on the other side = 60 ^o