Finding refractive index from polarization ratio at 37.5°

[fkf]

Unpolarized light falls on an angle of 37.5 ° with a plan glass surface. The reflected light polarization is examined with a Polaroid. The ratio between maximum and minimum intensity from Polaroid when it is rotated around is 4.0. Which is the refractive of index glass?

I would like to use the equation which relates the Intensity with the incident angles with the refraction angle. But doesn't really find out how.

 

[DrDu]

The relevant equations are Fresnel's equations:
http://en.wikipedia.org/wiki/Fresnel_equations
Are you sure that this question is not more apt for the homework help forum?

 

[fkf]

The relevant equations are Fresnel's equations:
http://en.wikipedia.org/wiki/Fresnel_equations
Are you sure that this question is not more apt for the homework help forum?

Oh sorry, of course. Wont happen again. Thank you.

 

[Redbelly98]

Since the OP has posted the question in the homework forums, I am locking this thread.