Finding Refraction Angle and Wavelength in Water for Sodium Light?

[h20proof]

A narrow beam of sodium light (λ=5893 A) is incident from air on a smooth surface water at θ=35°. Find the refraction angle and wavelength in water.

n=λ_0/λ:wavelength of light in a material
n_asinΘ_a=n_bsinΘ_b: snells law
n=c/v:index of refraction

I tried using the wavelength of light in a material to find n. I got confused because λ will equal each other. I am not sure if it is correct. Please help. Thanks

 

[haruspex]

You need to look up what n is for water, then apply the equation to find the wavelength in water.

 

[h20proof]

n=λ_0/λ
λ=λ_0/n, water n=1.33, and λ_0=5893
λ=5893/1.33= 4431 A Is this correct?