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**1. Homework Statement**

Index of refraction of air is being treated as 1, index of refraction for water is 1.33.

W is given as

*6.1*cm, the problem is to find H.

**2. Homework Equations**

By Snell's Law,

*n*.

_{1}sin[tex]\Theta[/tex]_{1}=n_{2}sin[tex]\Theta[/tex]_{2}We can also use at least one of the trigonometric equations,

*tan[tex]\Theta[/tex]=opposite/adjacent*.

**3. The Attempt at a Solution**

Since we know n

_{1}and n

_{2}, we can reduce the Snell's Law equation to:

*sin[tex]\Theta[/tex]*.

_{1}=1.33*sin[tex]\Theta[/tex]_{2}We can also get that

*tan[tex]\Theta[/tex]*and

_{1}=6.1/H*tan[tex]\Theta[/tex]*via basic trig, and these can be combined to get

_{2}=3.05/H*tan[tex]\Theta[/tex]*.

_{1}=2*tan[tex]\Theta[/tex]_{2}The problem is that I can't see any way to combine any of those equations that will let me isolate a single variable (H, [tex]\Theta[/tex]

_{1}, or [tex]\Theta[/tex]

_{2}) so that I can find its value and plug it in to solve for the other variables.