Calculating Angle of Refraction Using Snell's Law

[hardwork]

Homework Statement

The figure (http://i43.tinypic.com/2dt5e2e.jpg") shows a ray of light traveling through a gas (n = 1.00), a solid (n = 1.84), and a liquid (n = 1.61). What is the angle θ made by the ray as it enters the liquid?

Homework Equations

(n1)(sin θ1)=(n2)(sin θ2)

The Attempt at a Solution

(1.00) (sin 90-35) = (1.84) (sin θ)
θ = 26.4 degrees

(1.84) (sin 26.4) = (1.61) (sin θ)
θ = 30.5 degrees

 

[rl.bhat]

(1.00) (sin 90-35) = (1.84) (sin θ)
This is wrong. The angle of incidence is the angle made on the incident ray with the normal.

 

[hardwork]

Would I just use sin 35 then? I'm confused.

 

[rl.bhat]

yes.

 

[hardwork]

Thanks! I'll try it again:

(1.00) (sin 35) = (1.84) (sin θ)
θ = 18.2 degrees

(1.84) (sin 18.2) = (1.61) (sin θ)
θ = 20.9 degrees

 

[rl.bhat]

It is correct.