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**2. snell's law n1sin[tex]\Theta[/tex]1=n2sin[tex]\Theta[/tex]2**

**3. sin[tex]\Theta[/tex]1=1.33(sin68)**

After doing this I took the inverse sin of it and it comes up as error on my calculator. I know it should be an easy question but I dont know where I am messing up.After doing this I took the inverse sin of it and it comes up as error on my calculator. I know it should be an easy question but I dont know where I am messing up.