Light Refraction: Find Angle of Refracted Ray

[bfr]

Homework Statement

A ray of light strikes a piece of glass (n=refraction index=1.5), making an angle of 30 degrees with the surface. What angle does the refracted ray make with the surface?

Homework Equations

Snell's Law: n1*sin(theta1)=n2*sin(theta2)

The Attempt at a Solution

We're only given one n...how do I do this?

 

[DMac]

Is the question assuming that it's coming from air?

 

[tiny-tim]

We're only given one n...how do I do this?

Hi bfr!

easy-peasy … you can assume that, for air (it is air, isn't it? ), n = 1.

 

[bfr]

OK, I didn't know we're just supposed to assume that n=1, thanks.