BER'S MATH PROBLEM: The Refractive Index of Water

[willydavidjr]

Let n denote the refractive index of water. What fraction of the speed of the light in air is the speed of underwater light? Let $$\theta$$ denote the critical angle for light going from water to air. Find the value of sin $$\theta$$.

 

[Andrew Mason]

Let n denote the refractive index of water. What fraction of the speed of the light in air is the speed of underwater light? Let $$\theta$$ denote the critical angle for light going from water to air. Find the value of sin $$\theta$$.

I suggest that you look up Snell's law.

AM