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Homework Help: Geometrical optics #2

  1. Apr 12, 2014 #1
    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
  2. jcsd
  3. Apr 12, 2014 #2


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    You need to look up what n is for water, then apply the equation to find the wavelength in water.
  4. Apr 12, 2014 #3
    λ=λ_0/n, water n=1.33, and λ_0=5893
    λ=5893/1.33= 4431 A Is this correct?
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