Question

Hello,

I'm having some trouble with this physics question, any help is appreciated thanks!

A beam of monochromatic light passes from air to water (n = 1.33) to glass (n = ?). The two interfaces are parallel to each other, and the angle of incidence in air is 26 degrees, and that in the glass is 18 degrees. What is the index of refraction of the glass? Keep 2digits after decimal point. Your answer should be formatted like: 0.00

Answer 1

Snell's law : ni sin(i) =nr sin(r)

From air to water:

1 sin26 = (1.33) sin(r)

sin(r) = 19.24 deg

now from water to glass.

(1.33) sin(19.24) = n sin(18)

n = 1.42