Indices of refraction when wavelengths are given

[ikihi]

Homework Statement

A parallel beam of light containing two wavelengths, λ₁= 400 nm and λ₂= 650 nm, enters the silicate flint glass (at a angle of 41 degrees, relative to normal) of an equilateral triangle (60 degrees at each angle) prism. At what angle, relative to the normal, does each beam leave the prism.

Homework Equations

n_air ⋅ sinθ₁ = n_prism ⋅ sinθ₂

The Attempt at a Solution

I don't get how to get the two different indices of refraction for the prism, one for each given wavelength.

 

[kuruman]

If not given, I would look them up on the internet.

 

[gneill]

A very nifty web page that I came across concerning glass refraction indexes:

https://refractiveindex.info/?shelf=glass&book=SCHOTT-F&page=F2