Answer to Question #214747 in Optics for lala

Question

2. A beam of light strikes one face of a windowpane with an angle of incidence of 30.0°. The index of refraction of the glass is 1.52. The beam travels through the glass and emerges from a parallel face on the opposite side. Ignore reflections.

(a) Calculate the angle of refraction for the ray inside the glass.

(b) Show that the rays in the air on either side of the glass (the incident and emerging rays) are parallel to each other with the aid of a diagram.

(c) Calculate the speed of the light in the glass

Answer 1

$n=\frac{\sin\alpha}{\sin\beta},$

$\beta=\arcsin\frac{\sin 30°}{1.52}=19.2°,$

$v=\frac cn=\frac{c}{1.52}=0.66c.$