- #1
Kaldanis
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Homework Statement
A ray of pure yellow light reaches the surface of a pond at an angle of incidence of 60°. What angle does it make with the normal inside the water?
Speed of light in air = 300,000,000 m/s
Speed of light in water = 225,000,000 m/s
So the Refractive index μ = 1.33
Homework Equations
μ = angle of incidence / angle of refraction
The Attempt at a Solution
μ = sin i / sin r
1.33 = 60° / sin r
sin r = 60° / 1.33
So the angle of refraction equals 45.11°. Is this correct? I believe this is the correct way to work it out, yet when I check the answer online using various calculators the answer comes up as 40.62°. Am I doing something wrong?